Here is a Manz Beer Ball Tap Knob from the Philadelphia Brewing Company located in Philadelphia, PA. This Manz Beer Ball Tap Knob is from the 1940’s era and is in excellent condition for it’s age. It is made of a celluloid plastic face mounted on a black bakelite body. Manz Beer was one of the flagship beers that the Philadelphia Brewery produced from 1934 to 1949.