Not a radio, but a 1949-50 Rogers Majestic / Phillips television knob. Looking for 1 of the smaller “inner” knobs, that was used on this series of tv’s. Long shot I know, but maybe someone has one in their stash somewhere. The Phillips model is a DV1050, and the Rogers / Majestic is a VR1039. It has a 3/16″ shaft hole and takes a set screw.
Tony