rare and all original late nineteenth century privy dug heavily irridized dark olive glass porter shaped malt extract bottle manufactured for johann hoff, philadelphia, pa. the squat body and steep shoulders lead to a long, straight neck and an applied tooled oil finish. the bottler's name runs around the shoulder. the richly colored glass features allover heavy irridization in the form of a rainbow patination. according to the label, the malt extract was a dietetic and healing remedy, so a medicinal or health-enhancing substance.