The Grand Antique Mall, located in Cincinnati, Ohio, presents an Antique American-Made Amber Apothecary Chemist's Glass Bottle Hallmarked PYREX on the bottom and featuring an acid-etched label: AMMONIUM SULFIDE (NH4)2 SO3H2O. The PYREX brand, introduced by Corning Inc., in 1915,  were bottles of low-thermal-expansion borosilicate glass used for laboratory glassware. The embossed hallmark on the bottom reads:                     

                                          PYREX

REG. U.S. PAT.OFF.

MADE IN U.S.A.

          E - 2

There is no stopper. Circa: 1920. Perfect bottle for collectors, and a fine gift for medical school students, chemistry and pharmacy majors, physicians, and all interested in the world of chemistry and chemists’ containers. DIMENSIONS:  Bottle: 7”H.  Base Diameter: 3.25”. WT=1.00 lbs. QUESTIONS? Please send us a message, and we’ll promptly reply.