Hi!  My name is David Whitten.   I’m interested in the general history of the glass manufacturing industry in the United States, and especially within the sphere of container glass, electrical insulators and tableware (both pressed and blown).

Bottles, jars, jugs and containers of all types, antique fruit jars,  glass insulators,  fishing net floats,  EAPG (Early American Pattern Glass),  Depression Glass,  antique children’s mugs,  and other items are some of the forms of glass I enjoy learning more about.   There’s alot of great information already available on the web, as well as in books and magazines, but I’ve tried to gather some of the very best, basic info together onto this site, in particular concentrating on identification marks found on bottles, insulators and tableware.  I’m also in the process of adding various articles to this site, discussing various glass companies,  different types of glass and glass items. This site is a “work in progress” started in 2004.

The glassmaking industry in the US is a huge field that dates back to the 1600s, and covers a vast array of items and applications,  including both handmade and machine-made glass.

According to historian Rhea Mansfield Knittle (Early American Glass, 1927), one of the earliest glass manufacturers in the United States (not counting the unsuccessful attempts at Jamestown in 1607 and 1621) who may have produced considerable quantities of glassware and actually met with some degree of success, was Johannes Smedes (or Jan Smedes), who operated an establishment — probably making bottles for the most part–  sometime in the period of 1654-1664 at New Amsterdam (now known as New York City) .

What is glass?

 Note: Although some collectors and researchers may consider this an “obvious” question,  it’s not quite as simple as that.  For a brief,  basic discussion on glass (especially concerning the most common type of glass used for containers and tableware), check out my webpage here: What is Glass?

Every glass object, even the most lowly, commonplace glass bottle,  has a story behind it, although all of the precise details may never be known.   Where was it made?   What was the name of the company or factory where it was produced?  How old is it?   Is it handmade?   Was it mass-produced by machine methods?  What type of glass is it made of? What elements/chemicals were included in the glass “recipe”?   Why is it a certain color?  If it’s  an older, hand-blown bottle, who was the glassblower who fashioned it?   Who was the last person who used it and handled it before it came into your possession? Where was the physical location of the sand supply that eventually was turned into the glass piece that you hold in your hand?   Is it American-made, or a piece that was produced outside the United States?   Can the company / maker be identified by the markings on it?   What do the markings mean?

All of these questions might come to mind to the collector  or layman,  flea market shopper,  historian,  archaeologist,  or casual hobbyist……….. and my site attempts to answer, in at least some cases if possible, a couple of these questions: Where, and approximately when,  perhaps, was this piece of glass made?

Five of the webpages within this site list glass manufacturers’ identification marks (alphabetically listed) found on container glass (bottles, jars, flasks, jugs, etc) and in some cases on other types of glassware.   A few examples of marks would be “I inside a diamond”,  “OWENS”,  “B in a circle” , “K in a hexagon” and “N in a square”.   Please click here which will take you to the first page with more introductory information and explanatory comments:  GLASS BOTTLE MARKS.

On this site are a number of individual webpages with basic information on some of the  glass factories that operated in the United States. To read any of the “glass manufacturer profiles” I have written (so far), and other articles pertaining to glass, please look along the right-hand side of any page for the list of Glass Manufacturer Profiles, and click on any link in that list.  I hope to add more information as time and energy permits!

One page in particular within this site is a list of glass factories that manufactured, or are believed to have produced, glass electrical insulators for telegraph, telephone and/or power lines. Although mainly listing U.S. factories, a few Canadian and Mexican factories are listed also.  Click here  to go directly to that page.  If you have additional information, please contact me (at the email address listed at the very bottom of any page on this site)  as I’m continually looking for the most accurate data available on these companies.  Sources of some of the information is included after each entry if I have it available.  This is an ongoing project, started in 2004,  and I’d appreciate any additions, corrections, or suggestions you may have!

Some of the information on glass insulators is from research originally compiled by N. R. Woodward, creator of the “CD” (Consolidated Design) numbering system now used worldwide by collectors for identifying and cataloging insulators.  A portion of the info in this site pertaining to insulator manufacturers  is drawn from various articles in the classic 2-volume reference book “INSULATORS: A HISTORY AND GUIDE TO NORTH AMERICAN GLASS PINTYPE INSULATORS ” by John & Carol McDougald (published in 1990).      Blue Aqua or "Hemingray Blue" CD 257 "Mickey Mouse" style glass insulator.

The glass insulator pictured on the right, a blue aqua or “Hemingray Blue” CD 257 “Mickey Mouse”, is a type made for electric power lines, and was made by the Hemingray Glass Company at their factory that operated in Muncie, Indiana. That particular example probably dates from sometime between 1900 and 1920.

I hope this site will be a help in your quest to discover more information concerning the wide world of glass and glass manufacturing. Please be sure to bookmark this site, and return often!

Thank you!



155 Responses to Welcome~

  1. Susan Day says:

    Hi David, my niece found a Hazel-Atlas bottle that we can not find anything about; it is a brown glass quart bottle, with X – O – X on the shoulder, and bottom has Atlas symbol, Registered X-O-X U.S. Pat Off 9-A-4081. Thank you for you time, Susan

    • David says:

      Susan, I think it might have been an obscure competitor to Clorox bleach, but I may be wrong. I can’t find anything of relevance on the web, although I wouldn’t be surprised if there is some information out there somewhere! There have been many short-lived companies and brand names, and sometimes about the only evidence left behind are the embossed bottles!

  2. 4everycloud says:

    I found a piece of glass with a key embossed on it I can send a picture as I would love to know more about it.

    • David says:

      Sorry, I don’t know anything about it.

      • Michael M. Elling, Sharon, Tennessee says:

        The Key Glassworks, LTD., was an extensive British company that combined with others over the 19th and 20th centuries. During the 1950s, they used a small door key symbol with the key pointing left on their containers. They merged with United Glass in 1962, according to Toulouse, in his book, Bottle Makers and Their Marks (1971).

        • David says:

          Thank you Michael!
          Although I have had a copy of “Bottle Makers and their Marks” for many years, and a lot of the basic data on my site is based on Toulouse’s research, I completely forgot about that glass company in my earlier response to “4everycloud”. Never having seen that mark in person, I had neglected to list it on my site.
          For more extensive info, Toulouse’s entry concerning Key Glassworks, LTD is on pages 299-302 of BM&TM. He also lists a “K in a square” mark as used by them from 1908-1954, and the door key symbol “since 1954”. Although, he didn’t state clearly whether or not the key logo was retired in 1962 when Key Glassworks merged with United Glass LTD.
          Best regards,

  3. Cassy says:

    Hey David. I have a mystery for you! Found two colorless ABM bottle bases embossed with T. G. CO. 1922. Can’t seem to track them down anywhere. They appear to be liquor bottles and were found in central Nevada.

    • David says:

      Hi Cassy,
      I don’t have any relevant information for you, and am not familiar with the mark you describe. According to Julian Toulouse’s “Bottle Makers and their Marks”, on page 493 he lists a Toronto Glass Company (Toronto, Ontario, Canada) and claims they used the mark “T G Co” but he writes that company was in business from 1894 to 1900, which is definitely too early for the machine-made bottle that you are describing.
      Also, I’m not sure in your case if the “1922” would be a mold/style identifying number, or have any relation to an actual date.
      Best regards,

  4. Shawna Gilmore says:

    Hi David
    My fiance and I are avid seaglass hunters, I recently found a half bottom glass bottle with the markings PL inside what looks like a shield. It is in the shape of a rounded rectangle. These are the only markings I have and I have searched your site over and over and cannot seem to figure out what this is. Any help would be greatly appreciated!
    Thank You

  5. Mary Olive says:

    I bought a glass decanter at a thrift store about 5 years ago. It is clear glass, marked 1 quart, 3 sides are molded with squares that contain 4 pyramids which meet in the middle of each square. One side of the decanter is clear. The marking on the bottom is an oval inside a diamond with an I inside the oval. The number to the left is a 7, to the right is a 2, and below is the number 4. Can you tell me how old it is ? I think I paid $2 for it.

    • David says:

      Hi Mary,
      Your piece was made by Owens-Illinois Glass Company (see my webpage on that glassmaker). The “7′ stands for their glass plant at Alton, IL. The “2” is a year date code which would stand for either 1932 or 1942. I cannot say for sure which year that would be. The “4” is a mold number.
      Hope this helps,

  6. Ben Dover says:

    I have stumbled across 8 thin gold leaf rimmed Highball? glasses. I cannot find a maker mark because im ignorant or there is nothing on any of them, i thought i seen what appeared to be an “F” on three of the eight. I hope this isnt against the rules but i posted via another website with pictures on an attempt to ID them.

    there are two pictures, one looks like a regular glass, you have to click on the thread to see the other.

    It has the Irish Clan of Arms for the “Coopers”

    Is this a novelty item that perhaps someone bought because their last name was cooper, or could these have been owned by a Family member many years ago.

    Either way I plan on using them if they are worthless, If not they will go in my collectibles display. I would like to know anything about them.

    Thanks in advance,
    Ignorant Glassware owner 🙂


    • David says:

      Ben, without a glass manufacturer’s mark, it is hard to be sure who might have made them, or how old they are. Are you familiar with the “Cursive L” mark by Libbey? Libbey has made Tremendous numbers of drinking glasses of all types and sizes over several decades. Also, the mark “F in a shield” is the mark of Federal Glass Company, also a prolific maker of glassware.

  7. charles says:

    I have a three-part iron Anheuser mold from my father and his days at Obear-Nestor Glass. Just wondering if you or anyone else you knew would be interested in adding it to a collection. I can email photos if needed.

  8. Robert DeVito says:

    Found a blue bottle on the south shore of long islands great South Bay today below is what it written. Note no MD next to Baltimore Approx 2 1/2″. Unfortunately a broken top no markings on bottom Thanks for any info. Did look up company but found none without MD
    Drug co

  9. Gary L. Coleman says:

    Was canoeing out of Florida city in the Gulf of Mexico when I came upon a bottle that had washed up around Cape Sable. Great condition and fully intact.I collect bottles, so looked it up when I got back a week later. AB P24 beer bottle. I was stunned at the age of the bottle , to be in such great condition.A real lucky find.

  10. Brandon Burress says:

    David, I recently found an aqua colored bottle with AB not connected but double stamped with the number 74 or 77 below it. I have researched it with no success so far and was hoping you may have some information on it. Thank you

    • David says:

      Brandon, all that I can tell you is what is already written on my site about the AB marks. (See pages on those marks). It was made by American Bottle Company, probably dating from the 1905-1917 period. The “74” or “77” is a mold number, and the double-embossing is called ‘ghosting’ by some collectors. That happens occasionally when the bottle is being blown. The molten glass shifts position slightly/momentarily when contacting the inside of the mold during manufacture, picking up a “double impression” of the engraving before solidifying into it’s final position. That happens within seconds.

  11. Elise says:

    I’m not sure if you can help but i live in Australia and today I found a J.R Watkins co. bottle. I have read about the company and found that they are a medicine company it also said they had factories in the U.S England, Asia and Australia.
    My bottle isnt like the bottles i found on the internet, the ones online most have cursive embossed writing with longish necks and no lids. ( google The J.R Watkins co old bottle).

    My bottle is a clear glass bottle with embossed block writing that says


    It has a short neck with (what i think is tin) screw on lid with their logo and Watkins written on
    on the bottom is a logo thing then the number F168 then beside it is a lone M

    I would like to know what it would have had in it an how old it is,
    thanks a lot from

    • David says:

      Hi Elise,
      Thanks for your post. I am not familiar with the variants of the Watkins bottles made outside the US, and have no information on them. I am sure there are many and varied!

  12. Brian Leach says:

    My name is Brian I found a bottle in Preston Connecticut is aqua in color with an connected and a6 under that how old do you think this is

  13. MARK DOUGLAS says:

    Just an FYI. I recently found a small clear glass medicine bottle embossed BW&CO. I think this is the Burroughs Wellcome & Co. {I’m not 100% on this.} It is about 2 inches high, 1 1/2 inch across and 3/4 inch wide. It still has the metal cap, badly rusted, fully intact. By the necking it looks to be from the 1930’s, as it is a single twist ‘thread’. The only markings are the BW&CO on the bottom. Does anyone have input on this marking and bottle type?

    • David says:

      Hello Mark,
      Thanks for your comment! I’m not personally familiar with that marking, but doing a bit of research, I am sure you are 100% correct on the mark attribution. Burroughs Wellcome & Company was founded in 1880 in London. (Merged with Glaxo in 1995 to form Glaxo Wellcome, now GlaxoSmithKline). An online search of photos of various bottles marked “B W & Co” show a variety of types, all fairly small medicine bottles, mostly in clear, aqua or amber glass. I would guess they mostly date from the c. 1890-1930 period, but it is hard to tell without examining individual examples closely for details on whether they are handmade (mouthblown) or machine-made.
      I’m assuming the BW&CO bottles are much more commonly seen in Great Britain rather than here in the United States. If anyone else wants to submit a comment here on the BW&CO bottles, please do.
      Best regards,

  14. I have just received (December 2015) an odd embossed NDNR NEHI soda bottle with the traditional M-in-circle mark dated 1980. It is not the traditional silk stocking NEHI design, but a coverage of dots in relief. Within the coverage are the traditional NEHI candy cane lettering design for all the fruit flavors. The logo is twice around the bottle. The bottle contains the original grape flavor cap for the Royal Crown Cola Bottler of Norfolk, Virginia. Every NEHI man I have shown it to is outraged by this design! –MikeEinTennessee

  15. Brad Winebarger says:

    David. My name is Brad W.Recently I’ve found a very large ( probably 25-30 gallons) clear glass bottle complete with glass stopper. Looks like a Sparklets bottle. The only visible markings are located on the top rim below the stopper. Markings are W.T. CO. E “E” is not punctuated and several spaces between CO and E. Whiteland Tatum Co. I can’t find any images of vessel’s this large. Not even close! Curious to find out how old it is and the original contents. Portions of the glass appear to be opelized. Any info? Thanks David

    • David says:

      Hello Brad,
      I know that Whitall Tatum made a huge variety of bottles ranging from tiny vials to huge carboys, but that sounds like one of their largest bottles they made! I am sorry but I have no information about it. I’m assuming it is a water bottle or chemical/acid bottle, and would certainly have originally been used along with (housed inside) a plywood crate to protect it during transportation.
      Best regards, David

  16. Jake says:

    Today I found a dark green Insulator. I work for the railroad so i find them often.
    But today I stumbled across one that has a “B” on the side and what looks like 0-1 on the top. Any help?

    • David says:

      Hi Jake,
      You have found a “beehive” style telegraph insulator made by Brookfield Glass Company. (Check out my overview on that company here).
      Some of the more commonly-found insulators seen along railroad tracks include these: Hemingray-42 (CD 154), which was the most common insulator used along railroads; Hemingray No. 40 (CD 152); Whitall Tatum No. 1 (CD 154 or CD 155); Armstrong DP 1 (CD 155) and others, but the “beehives” are somewhat older and they include the ones such as “H.G.CO.” (usually with an H on top) ; “H.G.CO. / PETTICOAT” made by Hemingray; “BROOKFIELD / NEW YORK” ; and the ones just marked “B” on the side. Most of the “B” beehive insulators have a “shop number” or mold number on the top. OO, OX or OI are examples. Sometimes the numbers appear backwards. Most, if not all of the “B”s were made between about 1906 and 1920 at Brookfield’s second plant located at Old Bridge, New Jersey. They range in color from light aqua to light green, medium aqua, to darker teal green, grass green, olive green and even a few ambers. Off-clear (light purple) beehives are also found. Hope this helps, David

      • boyd mace says:

        hi david i have a ball perfect mason jar embossed 18 J from your web page it said it only went up to 16?

        • David says:

          Boyd, there have been many, many different types/series of Ball Perfect Mason jars that were made over the years. Many different mold numbers and letter/number combinations are known. I was speaking of the most commonly found type of AQUA-colored BPM jars which typically do have a number (usually positioned in the center of the base), between 0 and 15 on the bottom. I’m sure there are exceptions here and there. I think some of the earliest versions of those jars have a letter/number combo on them instead of just a number. For more insight from Ball collectors, you might try posting a query on the antique-bottles.net site where there is a discussion section for fruit jar collectors.
          Best regards, David

  17. Johnny says:

    Hey David. I collect clorox bottles, and I know they aren’t worth much but it is fun for me. I have three made 1946-47 that were made with clear glass. Two quarts and one half-gallon. I am getting ready to get another one, a quart, and all of these quarts were apparently made at the Clarksburg O-I plant (#4). (4-6 under the Clorox logo) The half-gallon has a #20 which I think is San Francisco. (20-7 under the Clorox logo) Do you have any idea why clear glass was used instead of the standard amber? Also 3 of the 4 bottles were in North Carolina when I got them.

    • David says:

      Johnny, I can only make a guess, but it is my hunch that sometimes if there was a very large order of bottles being made and they were pressed for time, trying to produce the bottles as quickly as possible, they might have utilized clear glass from another tank (in addition to the amber tank) to help make up the difference. This was also shortly after the end of WWII so maybe there was some supply-related connection there?? I simply don’t know!

  18. Julia Deem says:

    Hi David,
    You have a photo of “CALDWELL’S SYRUP PEPSIN/ MFD. BY /PEPSIN SYRUP COMPANY / MONTICELLO ILLINOIS”. I have the same bottle but smaller than the one in your photo. It has an S on the bottom. You do not mention a possible S in the following paragraph. But when I look up a simple S as a mark you wrote it could possibly be from Lyndeboro Glass Company, South Lyndeborough, New Hampshire. Do you think they are the maker? What is on the bottom of your bottle?

    • David says:

      Hi Julia, I don’t think there is any connection. The “S” on the bottom of certain antique liquor flasks believed to have been made at Lyndeboro is a different “ball of wax”. The Caldwell’s Syrup Pepsin medicine bottles were (for the most part) made during later years, and many of them carry mold numbers and/or letters on the bottom which just identified a particular mold being used at the factory. I can’t prove it, but I think they are completely unrelated.
      Best regards, David

  19. Bill says:

    David: I found a clear glass bottle on a shipwreck that dates to 1872. Unfortunately I only have pieces. I can make out the following words and numbers: “Metropolitan Mil?” “157 6th” “W. Boulev?” “CCO Branch” “48” “New York”

    Any clues to the manufacturer or type based on that information?

    Thank you, Bill

    • David says:

      Bill, I’m sorry but I have no idea on what type of bottle that would have been. Are you positive the shards are all from one bottle (or type of bottle)?

  20. Bambi gosnell says:

    Hi David

    I have a 15″ round x 10″ tall bubbled glass bottle. It is etched with my grandfathers name followed by his birthyear 1898. The bottled is filled with an anchor and crosses. The top has a wood cork held in by a wood pin as well as a second wood pin under the throat of the bottle. I have no idea where this was made or how it was made. Any suggestions?

    Thank you,


  21. Mark says:

    I worked at a glass plant in Minnesota (Brockway Glass Co.) when I was younger. The air bubble defects were called blisters. Some of the more exotic defects in a glass bottle was a strand of glass across the body of the bottle. It was called a bird swing. Or small bits of glass on the bottom of the bottle called tramp glass.

    • David says:

      Mark, thanks so much for the interesting “inside” information! I appreciate your post! I was familiar with the term “blisters” but had not heard of the other two terms. So why were base bits called “Tramp Glass”? Because they were “hitching a ride”? Or sorta like being stuck to the bottom of a shoe after “tramping through broken glass”??!
      Best regards, David

  22. Ruben C. Gracias says:

    I’m always finding glass bottles under my house and most recently found a Dr. S. PITCHER’S CASTORIA blown stamped bottle. It has an air bubble in it.

  23. Anne says:

    Thanks for the wonderful information. I just found a Boyd’s Milk Glass lid in my yard in Northwest Arkansas. I live on top of what I think was a late 1800s, early 1900s dump site. That’s my guess from the variety of glass shards that turn up after every hard rain.

  24. Tammy Joslin says:

    David, I have a 5 gl glass jug. It says Mountain Valley Mineral Water. Hot Springs Arkansas on the side. On the bottom it has the diamond/o/I with a 7 on left side, 8 on the right. 5295 above the diamond/O/I and a 5 below. Can you tell me anything about it and what it may be worth? Thanks. Tammy Joslin, Wilburton OK. jo

    • David says:

      Hi Tammy, your water bottle was made by Owens-Illinois Glass Company. See my page on that company. The “7” is a plant location code for their Alton, Illinois factory. The “8” is a date code……. 1938 or 1948, don’t know which. “5295” is an inventory/catalog number assigned to that style. “5” is a mold number. This site is not intended to be an appraisal site (although I have mentioned this repeatedly on my site, including in the introductory comments on the GLASS BOTTLE MARKS pages, but I’m still constantly bombarded with questions on value) so I now just advise collectors to go on ebay or other sites and find comparable bottles and check ending prices (actual COMPLETED auctions, NOT asking, beginning, or minimum prices). Best regards, David

  25. manitoba glass guy says:

    Hi I am looking for information on a Mason’s improved jar 2 piece post, blown in mold with ground lip. with the number J195 on the base

  26. shari says:

    Do u have any information on a authentic fishtail glass fishing float

  27. Penny Garcia says:

    I unearthed an old bottle . The bottle is circular, the only marking is a sun with a R in the middle on the bottom with a number 1 underneath it. Curious about the maker.

  28. hi David, thanks for the info. I bought 2 giant amber (beer) bottles at a WI estate sale yesterday which you have helped me identify as Owens Illinois, 1934 & 1935, plant #6 (Charleston WV), mold #7. They have flip top rubber stoppers with wire and one has remnants of the original “consumption tax” label, or I think that’s what it is. One is open (the other stuck shut); I examined the bottom of the open one’s rubber stopper and it’s marked but too hard to read. Thanks again.

  29. 'MILLE says:


  30. Rita Mc says:

    Hello David-
    I have an old aqua bottle with the R & CO on the bottom but instead of a number under the R & CO there us just the letter R. I followed your suggestions to check out the glass maker marks but didn’t see any mention as to what the R might stand for. Could you please enlighten me? Thanks!

    • David says:

      Hi Rita, I assume it is just a bottle mold identifier (or “shop” identifier), serving the same purpose of the numbers often seen immediately below the “R & CO” marking. Sometimes letters were used instead of numbers. If there is any specific reason above and beyond this, I don’t know what it would be.

  31. Mark McCoy says:

    I found a 7 oz. clear glass bottle embossed with ”Mtn. Grove Creamery Ice and Electric Co. Mtn. Grove Missouri. It also had embossed on the bottom M. G. 7 oz. Is this the makers mark? At the base of the bottle I found 081410R. The bottle has the ”whittled” look to it. I also have a “Coke” bottle that has Mtn. Grove Missouri embossed on the bottom of it. I grew up in Mtn. Grove but no longer live there. Do you know if there was a bottle mfg. co. there ?

    • David says:

      Hi Mark,
      I’m not familiar with the bottle, but a quick google search (of “Mountain Grove Creamery Ice and Electric Company”) indicates the company was in business in the early 1920s, and they produced ice cream and butter. There was a fire in 1922 which caused a great deal of damage. I am guessing the bottle could be a soda bottle (?) and perhaps they sold a variety of other products including carbonated beverages. Some ice companies in the late 1800s and early 1900s were known to bottle beverages in addition to selling ice.

      Concerning the Coke bottle, if you get a chance please check out the introductory comments on my page “Glass Manufacturers’ Marks on Coke Bottles”. I am sure there was no actual bottle-MAKING factory at Mountain Grove, but there would have been a local BOTTLING (filling) plant located in that city or nearby. Coke had bottles made for them (by many different glass companies over the years) with the names of well over a thousand towns and cities across the United States embossed on the bottoms, and the bottles were meant to be circulated within that area and returned to the local bottling facility for re-filling. Many of the older Coke bottles (and other brands of soda) were filled and re-filled dozens or even hundreds of times during their “use life”. Most Coke bottles have a glassmakers’ mark on them, alhough it may be faint………sometimes on the “waist” or “heel” area of the bottle, or on the base.
      Hope this helps a bit,

  32. Diana Smith says:

    I found an A.B. Co. bottle in 1962 in mint condition, looks like it was made in a wooden mold and has an applied lip. It has A.B. Co. D 9 on the bottom. The B. and the C are doubled stamped. Have anyone seen another doubled stamped beer bottle like this and is it worth anything?

    • David says:

      Hi Diana,
      Although there has been alot of misinformation published over the years about “wooden molds” being used for bottle production, the great majority of glass containers made after the 1840s or 1850s era were not made in wooden molds, but in cast iron, and later, steel, molds. Sometimes the surface of the glass has a “grained pattern”, or so-called “whittle” that appears to have been caused by forming in a wooden mold, but in general this “look” was actually caused by the molten glass being blown into a mold that was not quite pre-heated properly. The molten glass begins to cool a little too quickly in contact with the inner mold surface, and this causes a distorted or smeared look to the finished bottle, sometimes looking like the surface of wood that has been whittled or “flaked”, hammered metal surface, or like the appearance of heavy rain beating against a windowpane.
      ALSO, especially in the 19th century and before, some bottle and jar molds were poorly “finished” (the inside surface was not well smoothed or polished, or was developing rusty areas) and these are other reasons why the surface of a finished bottle may not look quite “right”.

      Also, the “double stamped” appearance of the letters B and C is called “ghost embossing” and this is very common on glass insulators, also sometimes seen on bottles. This occurred when the molten glass shifted very slightly within seconds, (or fractions of a second) of being blown into the mold, “picking up” a part of the lettering, before coming to rest in it’s final position inside the mold, creating the double-stamp effect.
      In general, ghost embossing does not increase the value of glass, although it is of some interest to those collectors who look for oddities and manufacturing errors in antique bottles and insulators.
      The “A.B.CO” and “AB connected” beer bottles were made in very large numbers, so being so plentiful, they have only minimal values to bottle collectors, even considering the fact they are authentic antiques and most are well over a hundred years old.

      Hope this helps!

  33. Kaye says:

    I was wondering what the bottle was on the far left on your front page picture (left of green insulator and red hobnail voitive). I have a similar bottle that is 90 mm tall, 2-piece mold, entire seam with no finish (on rim), uneven, unground rim and very irregular light green tinted glass with air bubbles. The glass is very irregular in thickness and the rim is uneven with no internal or external roll. No markings…any help identifying this would be wonderful. Thanks

    • David says:

      Hi Kaye,
      I believe it is a type of “tube vial”. The example shown is similar to what you describe…….it is handmade, about 87 mm tall, two vertical seams from top to bottom, in a very light green-aqua tinted glass. Smooth base with no markings. I believe I found this in a dump or construction site somewhere, but to be honest I don’t remember exactly where, or what age range of items were found with it. However I believe it does date from sometime in the 1870-1910 time period. This link shows a page from a catalog showing bottles of a somewhat later time period (Illinois Glass Company, 1906 catalog, on Bill Lindsey’s bottle site)— check out some vials shown here:
      Best regards, David

  34. Sandy says:

    First of all I love your website, I use it quite often to identify the age and makers of all my vintage glass collectibles. Thank you!

    I have an item I can’t seem to find anything about. It’s an old glass rolling pin. The person who gave it to me said it’s from the 1950’s, but I don’t think they “know” this for a fact.

    The mark in the glass has a capital M within two circles. Outside the circles is what I think is a capital G, but it could be a 6 or 9.

    Any info on who the maker is, would be much appreciated! I would love to learn more about this piece, it’s the first glass rolling pin in my collection.

  35. Katy says:

    I’ve got a tiny glass jar, with a key embossed on the bottom and the number 106, could you tell me more about it please if you can?

  36. Mike Giardina says:

    i have an amber bottle with jaynes written downwards on one side and tonic on the other.and in between that it says “good for mother and child (in caps) on the bottom it has “CROWNFORD Co (with a _ under the o) INC” also it has most of the paper label “JAYNE”S EXPECTORANT for coughs colds there is more. the picture is a kid about 4 or 5 yrs old onthe shoulders boy looks about 12 or 13 yrs old. the clothes look like from early 1800s. it holds about a qt. i can’t find it anywhere on line. any ideas on the age of it.

    • David says:

      Hi Mike,
      It’s a reproduction bottle, (loosely patterned after original bottles from the late 1800s marked JAYNES) probably dating from the 1970s. See my webpage on Crownford China Company. Most of the glass bottles sold by/through that distributor were apparently made in Italy.

  37. Bridget says:

    I found some galsses that are blue they look like wine glasses with unique detail& a a oval with a face engraved in it im very curious about them theres an AVO then what looks like an upsidedownv & #s stamped in middle of the bottom if there is somewere I can reasearch these id love to see were they’ve come from thanks

    • David says:

      Sounds like it would be something marketed by AVON? I have no other info, but you could try searching online via Google or Bing with keywords that describe the glasses along with the word AVON.


  38. Becky stacy says:

    Hi I have a jar with a mark resembling a flower of 6 petals. Any ideas?

  39. shereeleaheree says:

    I have found a small clear bottle with a star embossed on the bottom that says franklin product and has some orange thick stuff still inside with a non-removable lid that has a hole in the top. Can anyone tell me about it?

  40. Yogi Bear says:

    Here’s what I have to say about your site:
    It has been nothing but helpful to me in identifying age, maker, and what is real/fake (like nuking) in terms of all things collectible glass. Thanks so much for creating this wondrous place!
    With gratitude,
    Yogi Bear.

  41. Norene St.Martin says:

    Hi David, I have a bottle shard with an acorn on it. When I researched it I found your article and this awesome website. My question is that the stem on the acorn goes to the left and not the right like you show, and I’m sure what I have is not the bottom of a bottle. Do you think this is the Bellaire Bottle Co mark ? Thank you for your help, Norene

  42. Andy says:

    Friend of mine found a bottle in a wreck (sunk by a U-Boat over 70 years ago).

    Mark on the bottom is:

    MADE IN U.S.A.

    Anyone have any clue on this one?

    • Lori says:

      Andy, I found a small clear bottle with no label in the crawl space of my former home (home was built in 1927) in Rocky Mount, NC, with the mark on the bottom:

      L&F PROD.CORP.
      MADE IN U.S.A.

      There is also a capital “H” stamped into the screw-on cap. I suspect there is a link here!

  43. Ewart says:

    Several years ago, my father found a similar bottle (clear glass) with the D&M marking and the number 13917, on a beach on the Island of Dominica in the Caribbean. 20″ tall and 5.5″ in diameter at the base.

    • David says:

      Thanks Ewart! [Ewart’s post is in reply to query about D&M bottle posted by “Charlie” on November 14, 2013, posted farther down on this page].

  44. Jerry says:

    I’ve just started collecting vintage jars & don’t know a lot about them. I’ve got some old blue numbered Ball Perfect Mason Jars & I’m wondering if the ones that have a line with the number is suppose to be read with the line over the number or below it. Thanks.

    • David says:

      Hi Jerry, the number is read with the line underneath it. An underline is usually seen with a “6” or a “9” mold number to clarify which numeral is meant, since the number might otherwise be read upside down. Although it is sometimes obvious which number is meant, there are a number of different ways in which they were drawn, occasionally leading to some confusion.

  45. Cindy Plummer says:

    I have a Biltmore Dairy half pint milk bottle marked Duraglas from 1953. I’m trying to determine what plant it came from. The plant code is 17. Can you tell me where this plant was or is? Thank you.

    • David says:

      Cindy, Owens-Illinois plant #17 was located at Clarion, Pennsylvania. Originally Berney-Bond Glass Company, later acquired by Owens-Illinois, operated as plant #17 from circa 1930, up til it’s closing in July 2010!

  46. cynthia weed says:

    Are the mid-eighteenth century Cheesborough Vaseline bottles valuable?

    • David says:

      Hi Cynthia,
      No Vaseline jars were ever made in the eighteenth century (1701-1800), but I’m assuming you meant the 19th century (1801-1900). The earliest type of marked Vaseline jars (the cork-top style, as shown on the far left in my photo of clear jars on my webpage about Vaseline jars) were probably introduced in the late 1870s or sometime in the 1880s, although no one knows exactly when. They are common enough to have a relatively low value to bottle collectors, perhaps 2 to 5 dollars in excellent condition. However, I am not really an appraisal site, so I can’t vouch for that value estimate. A keyword search on ebay over several months’ time period may yield better info on the prices they actually sell for.
      Best regards, David

  47. Carlena-OcoeeFL says:

    Hello David….
    I am completely amazed to of happened upon your “very informative” website on the Glass Mfg. History. In an added note to your statement under AVON BOTTLES…..

    “There may have been other glass manufacturers involved in the production of Avon glassware, although I am not sure of their identities, if so. If you have pertinent information in that regard, please feel free to contact me!”.

    …… I can confirm to you that several AVON Decanters were manufactured by Owen-Illinois, especially at the Huntington, WVa. plant. My Mom-in-Law worked for the Huntington, WVa. plant for about 25 years up until they closed the plant (approx. 1993/1994). We have a pair of original AVON Dueling Pistol 1760 decanters ( glass only not the added silver plastic decor or bottle caps). One has on the Butt of the pistol “AVON 5” and the other “AVON 10”. From what I’ve found in research these decanters were marketed by AVON, around 1973 with Deep Woods After Shave.

    Can you give us any idea what these glass factory blanks could be worth??? I can send pictures also if you would like, just let me know.

    • David says:

      Thanks Carlena, I appreciate your information. Owens-Illinois seems to have made just about every kind of bottle, jar, jug or flask imaginable (as well as lots of other kinds of glass items), so this would not come as much of a surprise. I have no idea on “value” of such items. I am sure they would have some value to “serious’ collectors of Avon bottles and memorabilia, but I don’t know enough about them to make a judgment call on their average market “worth”. What color is the glass on these bottles? Do you know what glass colors Owens-Illinois utilized for the Avons they made? If you wish, you can send pics to my email address (listed at the bottom right corner of any page on this site).
      Best regards, David

  48. Eleanor Boston says:

    I have a green glass jar or vase shape – approx. 5″ diameter at base and 9″ high, 2″ at neck. It has a five thin spirals of glass from the top which end with the seal. This is a head and shoulders with a face on it and a line around the head depicting hair. The seal aperture is about 1″ across. I would appreciate any knowledge of this jar please from anyone. Many thanks, Eleanor (UK)

  49. Xanna says:

    Hi David, I have the rarest Avon bottle to date. The tan top,Yellow taxi. The production was stopped due to the mistake of the style and color not matching the picture on the box. The production was stopped after only a handful was made. The new taxi would have a black top now matching the box. The style of the top would also be changed. The black top taxi would be produced in large numbers marked 41338 or 41397 or 41369 all posted on the net. This mistake of the tan top and style would become the least produced in number Avon bottle to date. The bottle 42418, is this the 18th one made in the production?

  50. Kim Fernandez Hunter says:

    Have several clear glass bottles 9 (I) 70.. With a 26 on it at the bottom

  51. steve harford says:

    hi david:
    i found an old hazel atlas jar. it has the little a inside the large H stamped in the bottom. it is tear drop shaped and appears to have 5383 above the ha. i have looked for the jar and the # but cannot seam to find anything about it. its a really neat shape and im curious about it. any help would be greatly appreciated. thanks Steve Harford NY

    • David says:

      Hi Steve, there are a very few known Hazel-Atlas catalogs still in existence picturing many of their bottles and jars from the early 20th century, but I don’t have access to them.
      Hazel Atlas made thousands of different types of bottles, jugs, jars, etc over many decades. Many of H-A’s containers bear four-digit numbers on the bottom which are design or inventory numbers assigned to a particular shape or size. I don’t know when the “5383” style jar was made.

  52. Erica says:

    I am trying to find out who the manufacturer of glassware with the hallmark “T” with a star around it is. I have some codd bottles that were unearthed in Scotland with this hallmark and nothing else. Please, if anyone has any information I would love to know!

    • David says:

      Erica, I’m posting your query here. I am guessing the “T inside a star” might be he trademark of a glass company that operated sometime in the late 19th, into the early 20th century in Great Britain (although I do not know), or it might stand for a soda water company or distributor (??). Maybe someone who specializes in collecting Codd-style beverage bottles will have more information for you.

    • bo says:

      Try this site and links page. Maybe be a good resource for information or contacts. http://www.brightonbottles.com/

      • David says:

        Hi, I’m posting your link here, for bottle collectors in Great Britain or elsewhere who might be looking for info on bottles from Brighton. Thanks for sharing…..

  53. Alex says:

    I have a ABGA (in cursive script) mason perfect made in the U.S.A however the glass lid has abca at the four corners of a cross ? Is this (as I think), a 1920s jar? and can you tell me anything else about it thanks.

    • David says:

      According to information in the reference book “The Fruit Jar Works, Volume II” (1987, by Alice M. Creswick and Stephen B. Creswick), on page 1, three variants of the ABGA jars are listed and illustrated. These jars are described as having been made by both Hazel-Atlas Glass Company and Ball Bros Glass Company FOR the Anglo-Belge Glass Association of London, England. “Circa 1910 and later”. Your particular jar variant is listed as Jar #5 (also listed as such in the accompanying “Redbook” price guide for jars). This is the only information I can provide. Perhaps a reader might know more about them.

  54. troy says:

    I recently purchased an E O Brody piece (M6000) but the “Y” is upside down! Does this indicate a year of manufacture? how many others have this anomaly ? any other info regarding this would be of great help.


    • David says:

      Troy, I strongly doubt that any markings on the E O Brody glass items are actual year date codes. However, perhaps a reader out there has more info on these markings. Maybe we’ll get lucky, and a former worker who made this glass can ‘clue us in’ on the meanings of the marks. I assume the “M6000” is a code number for that particular style vase or bowl.
      Best regards, David

  55. Sage Hennessey says:

    Hi David,

    I have a glass bottle with a circular base bottom. The bottom has “47” on it, with two rings of circles around it almost like a target. Do you have any idea what company may have made this? I found it on a beach in Delaware.

    • David says:

      Hi Sage,
      The bottle base sounds like that seen on alot of the typical glass non-returnable soda bottles produced in the 1970s-2000s era, especially on alot of emerald green bottles that once held such sodas as Sprite, 7-up and other lemon-lime brands. Many of them are marked on the bottom with a mold number or other numbers placed in the center of concentric raised lines. Large numbers of those bottles were made by Owens-Illinois (I inside an O); Brockway Glass Company (B in a circle); Anchor Glass Container Corporation (anchor symbol); Glenshaw Glass Company (G in a square); Liberty Glass Company (L G) and other glass companies. Would there be a small emblem or logo along the outer rim of the lower “heel” area of the bottle which may signify glassmaker? Sometimes the glassmaker can be identified by studying the heel closely……however many times the raised embossing is very faint. The base shards are often found by “sea glass” collectors beachcombing along the shores of lakes, rivers and oceans. Hope this helps! David

  56. Scott says:

    Hi any idea what these numbers stand for? Half gallon marked bottle. Dura glass with 6 on the left 4 on the right and 11 on the bottom do u have an email so I can send pictures

  57. HI David,
    Thank you for contacting me with this information. I also checked out the google patent site. It was interesting to read. I am still trying to find more information about what product was put in the bottle after it was manufactured. It’s pretty interesting. Thanks again.

    • David says:

      Hi Michele, from the design of the bottle I would assume it was intended to be a cologne or perfume bottle. Perhaps someone will run across an example with the original label still affixed! Thanks for your reply~

  58. Hi David, I found a bottle from Maryland Glass Company. Patent number d142616. I am curious about what might have been in the bottle. I found it in the basement of an old pharmacy.

  59. Charlie says:

    David I have a long neck bottle with the mark D&M on the bottom, I found it in Maine. Any ideas?

  60. Karleen Phillips says:

    I have a floral pot with E. O. Brody A-1431. There is also a sticker the botton the says design original y E. O. Brody, Cleveland,, Ohio Made in Japan. This is probably a mass produced floral vase. Does the A-1431 mean there were 1, 431 of these made?

    • David says:

      Hi Karleen,
      No. I’m not sure if you are speaking of a ceramic vase, or a glass vase?? In any case, although the number A-1431 does sound like it might be a “serial number” or one in a series of unique numbers applied to a product (similar to a “limited edition” serial number), this is not the case. It’s merely a catalog, style, or inventory number assigned to that specific vase design. I’m quite sure that all examples of that particular EXACT type of vase will carry the same number.

  61. Nick says:

    I have a small blue jar and on the bottom is a triangle inside a triangle. About same size as a Vicks vapor rub jar. Any ideas?

    • David says:

      Hi Nick,
      You have one of the earlier versions of the Vicks Vaporub salve jars. Don’t know the years the type with the triangles was made, but my guess would be 1920s-1940s era. Best regards,

  62. james says:

    I have a bottle I found in Atlanta Georgia I know its a machine botllei can not find any inf on it it is aqua green it is 8 inches tall 5 inches from top says Hagan & Dodd co below that it says red rock below that Atlanta Georgia on very bottom says red rock if any one can help me email me at loganwarrreng@yahoo.com thanks for any help

  63. Paul Evans Pedersen, Jr. says:

    Simply an amazing sight!! Wonderful information! Thanks!!

  64. Janell Bennett says:

    You have a great site here! I have a blue bottle with frosted blue figures of Greek gods. The mark on the bottom looks like “ROAN.” I can’t seem to find it anywhere. It was in my parents house when they passed. They were both in their 90s.Is there a way to send you a picture?

    • David says:

      Hi Janell,
      (To readers): Janell sent me a pic by email (thanks Janell), and I have the marking now pictured on this site under the “DOAN” entry on “Glass Bottle Marks~page one”. Any information on attribution would be appreciated! Thanks!

  65. Jolie says:

    Hello David – I’ve used your site before … LOVE IT! Question, my daughter found a bottle in our river. I’ve determined that it is Owens-Illinois. It is Amber in color and is shaped like a flask with a screw top. It has embossed on the top of the body “FEDERAL LAW PROHIBITS SALE OR RE-USE OF THIS BOTTLE”. It is a half pint. On the bottom it has the diamond with the O and the I in it. The numbers are located next to the logo (not to the right and left as some say they should be). They are as follows:
    0 – 8 (or maybe D – 8?)
    and the OI logo is to the left of these numbers which are lined up in the center of the bottom.

    Can you give me any info on where and when this was manufactured?


    • David says:

      Hi Jolie,
      Alot of the liquor flasks made by Owens-Illinois do not always have mold/date codes that are configured the same way as they usually are on other bottles, especially on soda bottles. I mention this on the Owens-Illinois page on this website. I’m not really sure how to read these codes. However, I am of the opinion (repeat: opinion) that the “47” is a date code for 1947. The “D-8” (and other D letter/number combos such as D-126) are often seen on the base of whiskey and other liquor bottles, and I think those numbers relate to distillery information in some way. Sorry, but I don’t have any other information on your bottle. Thanks for writing~

  66. Jen Chadwick says:

    Hi David, great site with loads of info. I was wondering if you could help me. I have a large glass jug, marked 500cl, 70mm, 3, with a N in a circle all on the bottom. It has a lovely shaped handle fully intact. The only info I could find was maybe Obear-Neston? Do you know of any other company worldwide with this mark, as I am actually in Australia. Any help would be greatly appreciated.

    • David says:

      Hello Jen,
      You are right to question whether it could be Obear-Nestor. I can state with confidence that it is NOT an American-made container. The “500cl” and “70mm” markings show it to be a product made (almost certainly) outside the US…… possibly a company in Europe or Asia. The Bucher Emhart Punt marks database Punt Mark Library (this is a pdf file) shows “N in a circle” was used by Nozaki Glass Company, of Japan, but I can’t find any really pertinent info concerning that company online. Unfortunately, I know very little about glass manufacturers in Australia. It is possible it was made there (?) Hopefully someone can put together a fairly complete list of marks from Australia (including recent/modern marks) and post them online. Thanks for your query, and sorry I can’t be of much help.
      Best regards,

      • Jen Chadwick says:

        Thanks so much. The measurements confused me too in relation to US standards.. Mind you, cl measurements haven’t been used for quite some time over here either. Thank you so much for the leads. Will keep searching and if I find any more info will post to you for your database. Cheers.

  67. Susan says:

    Hi David,
    This is a fabulous site! Thank you so much for your hard work and generosity!

  68. Valerie says:

    Hi David, its Valerie now I have a full brown bottle seams on the corner to the top. On the bottom has 2 circles with a diamond in the middle. The circle in the middle end up to 11 or LL. Real hard to tell its been in Grandma’s garage for who know how long.

  69. Lianna says:

    Hi David,
    Just want to thank you for your wonderful site. I volunteer at a Thrift Shop in Malibu and research a wide range of items from couture and fine china to vintage bottles and memorabilia. Guess I love learning new things especially those pertaining to history. I have one of the AB bottles with the connecting AB and have read the page on this mark. I guess these are quite common here in the west. What I can’t figure out is what the “X” stands for at 7 o’clock on the bottom. At 5 o’clock there is the number “5” which I am going to assume is the year.
    Thanks again and keep up the awesome work you’re doing!!

    • David says:

      Hi Lianna,
      Thanks for your kind comments about the site! Concerning the letter/number pair combination situated directly underneath the AB mark: No one, as far as I know, is absolutely certain what their purpose was. However, I am of the opinion (repeat: opinion) that they are mold and/or “shop” identifiers. Meaning, they identified a particular bottle mold and/or the “shop” (group of several workers assigned to producing bottles from that mold).

      When a number of identical molds were being used simultaneously to produce bottles, each mold carried a different number to identify it. If problems developed with the finished bottles, the defective mold could be quickly pinpointed.

      Many letter and number combinations are found on these bottles. I don’t know if a list of these markings exists on the internet (yet) but it is likely someone, somewhere is currently compiling such a list as we speak! I think there are many dozens (maybe over a hundred?) of letter/number combos that have been seen or recorded. Also……I am quite sure they are NOT date codes. If there is a date code on these bottles, it would be situated on the heel, not the very bottom.

      THANKS for writing!

  70. Jeff Marx says:

    David: Concerning L52- Lamb Glass Co. The L52 is found on more than milk bottles: I have a bottle labeled: “Breakstone’s Sour Cream one pint” with the L52 on the heel.


  71. jim says:

    I have an amber bottle about quart size -looks like an applied top. On bottom is round smooth indentation about an inch in diameter. Around that it says “New Albany Glas Works” (The one S in glass intentional) Can you tell me about when it was made-is it relatively common?

  72. terry says:

    Hello David,
    I went for walk with my dog this morning and happened to find an interesting bottle. Round top, with four curve bottom. Letters on bottom patd, H mark with letter A under middle line, 9 on same line and numbers at bottom 6214 set up as patd
    H with A under middle line 9
    Can you give me any info on this find? Bottle is approx 5-6 inches tall with narrow lightbulb shape on each side-wide on top narrows to bottom with 4 curved bottom.
    thank you Terry

    • David says:

      Hi Terry,
      Your bottle was made by Hazel-Atlas Glass Company; please see my page on Hazel-Atlas. However, I’m not sure from your description what type of bottle it is, or what it might have contained. Can you send me a picture of the bottle (to the email address mentioned at the bottom of the page).
      Thanks for writing,

  73. Greg Jackson says:

    Great site! Just wondering if you add makers marks to the pages when you find or have new ones sent to you? I have a bottle embossed Red River Mfg & Bottling Co. Denison, Tx. Makers mark on the base is a large “R”. I’ve only been able to find a short paragraph about the company, that was taken from a booklet in 1907.

    • David says:

      Hello Greg!
      Yes, sometimes I do add information to the site that has been sent in by readers. I should try to clarify something here, however. Most of the “makers’ marks” listed on this site are marks indicating the glass bottle manufacturer (itself), not the bottling company. I’m not familiar with that company, but am assuming that Red River Manufacturing & Bottling Company was a soda producer, and filled the bottles which were made by a glass company. (Are there any markings along the lower heel of the bottle which would indicate glassmaker?). There have been literally tens of thousands of soda, mineral water, and/or beer bottlers in business in the US for which bottles were made (by a glass manufacturer) with the name of the bottling company (or brewing company, etc) marked on the front. In many of those cases, there will also be a letter (or set of initials) on the base which corresponds to the name of the bottling company. So, in this case, it is not exactly a “makers’ mark” as defined by the average bottle collector, and these types of base markings are not usually listed (I mention this in my “introductory comments” on page one, but I’m sorry to say it is somewhat “buried” in the text!) In any case, I honestly don’t have the time, energy, or knowledge to list all of these bottling company names on this site. Nevertheless, I would like to see a pic of the bottle (I was wondering what style of bottle it would be………”hutch”, “crown-top” etc ) If you wish to, you are welcome to email a pic to davidrussell59 “at” att.net.
      Thanks very much for your post!!

  74. Awesome site, Very useful and helpful resource for sure I greatly Appreciate your hard work!

  75. JK says:

    what do you or your readers know about bottles embossed with “J Wittmann Woodhaven New York”? On the alternate side of the bottle it has a “J” overlapped with a “W”.

    Any information would be great!


    • David says:

      Hi JK,
      I’m not familiar with that bottle, but I would assume that it contained soda, mineral water, beer or ale. There are thousands of different bottle variants known just from the state of New York.
      The exact shape/style of the bottle can give info on approximate date range. If there is no makers’ mark, it won’t be easy to find out exactly what glass company manufactured the bottle. Information on the “J Wittmann” (owner of the bottler or brewery) might be found with a google search. The “J overlapping a W” is the monogram for Wittmann, and does not give any info on glassmaker. If you have a clear pic of the bottle (entire profile) please send it to davidrussell59@att.net. (If any readers of this site have concrete info on the bottle, please submit your comments!) THANKS! David

  76. Ken Bowes says:

    C in a triangle: If it has one of its points pointing up, and all three corners are rounded, it is Consumers Glass from Canada. In print, the solid triangle is to represent a molten gob of glass, and is printed in red..with a white C. I worked there from 1969 to 1973, at the Kipling Avenue facility in west end Toronto. They purchased Dominion Glass while I was with them, and later, with debt problems came into the world of Owens Illinois.