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Baltimore Glass Manufacturing Company, 1896 to 1903 (est.), shut down by court order for patent infringement-- caught using a copy of the Kribs press for making their insulators, a device patented by Brookfield, who won their molds and press(es?) in the lawsuit. Brookfield then reworked the molds to remove the old embossing, filling in the "B.G.M. CO." with blot-outs and re-engraving with "NEW YORK". "BROOKFIELD" was added to the previously blank other side. Most B.G.M. insulators are purple, with a few in off-clear and lemon; the Brookfield units are almost always light aqua, anything else is rare. B.G.M. glass is notoriously fragile and the insulators are usually chipped; the darker the shade, the more likely the damage it seems. The better condition pieces are often lighter colored, perhaps because they led more sheltered lives? B.G.M. molds are unique; the insulators made with them have a distinctive profile unlike any other. Study the pictures below paying particular attention to the profiles and the blot-outs will start to stand out on a crowded table of aquas at shows.

CD 102	Ice Purple	Purple	Dark Purple	Lt Aqua Blot	CD     133	B.G.M.C.	Light Purple	Light Aqua Blot

CD 134	Off Clear	Purple	Light Aqua Blot	CD     145	Light Lemon	Medium Purple	Dark Purple	Light Aqua Blot

CD 162	Ice Purple	Dark Purple	Green Blot	CD     164	Purple	Purple	Light Aqua Blot