CanYaDigIt
Posts: 848
Joined: 2/5/2009 Status: offline
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M in a circle.........Maryland Glass Corporation, Baltimore, MD (1907-c.1970s). Mark first used in 1921, according to trademark info reported in Peterson's 400 Trademarks on Glass (1968). This company specialized in cobalt blue glass bottles and jars. Many of the containers made for Phillips Milk of Magnesia, Bromo-Seltzer, Vicks, Noxema, etc, were produced here. Maryland also produced the most commonly seen type of "violin bottle" in various shades of blue (and probably other colors). Maryland Glass was acquired by the Dorsey Corporation in 1968, and I believe that the "M" mark was discontinued sometime in the early 1970s. Anyone with info, please contact me on how late this mark was used. Note: The "M in a circle" mark has also been used more recently by the Mosser Glass Company (Cambridge, OH, 1971-to date), but in those cases it is usually found on tableware, novelties, toothpick holders, etc.
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