General Electric Wafer Knob

G.E. knob used for tone control on various models. Sits under the KGE-1 knob.

I think the models below are correct.
Ivory used on models: L-613, L-621, L-632
Brown used on: L-631, L-632, L-652, L-633
Red used on: L-624, L-660

Dimensions: 1-3/8" diameter, thinnest part 3/32" thick, 1/4" hole