There were a number of bottle factories just in those states with a name beginning with “M”, which shows why it is so hard to know for certain who the maker of those bottles was. The unknown (unidentified) glass manufacturer was probably located somewhere in the Midwest, i.e. & P. BOCHART, NEW ALBANY, IND” are marked with a plain “M” on the bottom, and those would date sometime between 18, judging from the years that bottler was in business). (For instance, some beer bottles marked “F. 1880-1905, and the glassmaker in those cases predates Maryland Glass and to my knowledge remains unidentified. Also, a similar mark is seen on the base of certain mouth-blown amber, aqua and clear beer bottles (and a smooth-lip amber salve or cold cream jar) that appear to date c. If a bottle with a “plain M” is some type of medicine bottle and was made in cobalt blue colored glass, it is probably a product of Maryland Glass. Most Maryland Glass bottles, if they carry a mark, have the “circled M” on the base.
Exact period of use is uncertain, but verified on the base of cobalt “Milk of Magnesia” bottle from circa 1950.
M………………………….on the bottom of cobalt blue jars and bottles, usually Maryland Glass Corporation, Baltimore, Maryland (1907-c.1970s).Glass Manufacturers’ Marks seen on bottles, fruit jars, tableware and other types of glassware ~ Note: for introductory and explanatory comments and discussion concerning this section of the website, please click on the “A-B” link below which points to “page one”.
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