THEY USED A BLACK OR CREAM COLORED CENTER KNOB. CAME OFF THIS RADIO AND LIKE CHASSIS. Use red slider bar for more. The item "ZENITH RADIO PARTS 1940's BAND SWITCH, TUNING KNOB, ON/ OFF VOLUME CONTROLE" is in sale since Thursday, February 7, 2019. This item is in the category "Collectibles\Radio, Phonograph, TV, Phone\Radios\Tube Radios\1930-49".The seller is "bcoolradios" and is located in Cedar Rapids, Iowa. This item can be shipped to United States, Canada, Bahamas, Uruguay.