Maryland Glass Corporation
“M inside a circle” marking
This mark was first used in 1921, according to trademark information reported in Arthur G. Peterson’s 400 Trademarks on Glass (1968). However, Julian Toulouse, in Bottle Makers and their Marks (1971, page 341) writes that the “M in a circle” first appeared on bottles in 1916. I think his information is incorrect and the year 1921 did see the beginning of the use of this mark.
Maryland Glass Corporation was organized in 1907 as a vehicle for making large quantities of Bromo-Seltzer bottles for parent Emerson Drug Company, of Baltimore. Emerson Drug Company (founder and president, Issac E. Emerson) had been incorporated in 1891, and because of increasing sales needed a reliable source of supply for the large quantities of glass bottles needed.
This company was soon specializing in producing all kinds of cobalt blue bottles and jars. Many of the blue glass containers made for Phillips Milk of Magnesia, Bromo-Seltzer, Bromo-Caffeine, Vicks Vapo-Rub, Noxzema, and other products were produced here. Maryland also produced clear glass as well as cobalt.
The “M in a circle” mark is seen on tremendous numbers of glass containers from the 1920s through the 1960s, and cobalt blue jars and bottles from trash dumps of this time period are often found that bear this mark. Many of these containers have no identification or brand markings other than the “M in a circle” on the base.
Maryland produced the most commonly-seen type of figural “violin bottle” or “fiddle bottle” in various shades of blue (and probably other colors) although these bottles were not usually marked. They may bear a mold number on the bottom.
Maryland Glass was acquired by the Dorsey Corporation in 1968, and I believe that the “M” mark was used for a time thereafter, but eventually discontinued sometime in the 1970s.
According to info supplied by Ernie Dimler (see his posts in the Comments section of this page for more background info), the last glass bottles made by Maryland Glass were produced in 1980.
Maryland also used the “plain M” on some bottles, and rarely, an “M inside a G”, which are listed on the Glass Bottle Marks, page 4.
NOTE: An “M in a circle” logo is also seen on the base of tableware, novelty glass shoes, upscale reproduction pattern glass, various colored glass toothpick holders, etc, and in those cases it is the mark of an unrelated firm, the Mosser Glass Company of Cambridge, Ohio. (Maryland Glass made, for the most part, utilitarian and commercial containers.)
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