Here is a Deppens Beer Tap Knob from the Deppen Brewing Company located in Reading, PA.  This Deppens Beer Tap Knob is from the early 1930’s era and is in excellent condition for its age.  It is made of a white and cobalt blue porcelain enamel face mounted on a red bakelite body.  There is an actually another variation of this know with a Blue face on a black bakelite body; click here to view the other variation form my personal collection.