Bomberger's Schaefferstown, PA Antique Adv. Shot Glass Pure order Rye Whiskey 1900s

This is a very hard-to-find order late-1800s or early-1900s advertising antique shot glass that reads "Bomberger's Pure Rye." It is in excellent condition. There are no chips or scratches. It is not an etched glass but embossed with fired-on small particles of glass. Measures 2.25" tall with an opening diameter of 2".