1 gal. ? glass jug

Here for your enjoyment and possibly my edification is a glass jug that I found in the basement of a very old building in Seattle. It had no label and has five numbers on it, four #'s on one side towards the bottom and one # on the other. Probably mold marks. Thick uneven glass with bubbles throughout. Mold seams from top to bottom terminating into an off-center pontil mark. I can barely see a small square in the center of the bottom.