I see an L on the knob so presuming that is the headlight switch. You are probably turning a stamped chrome cover cap that is crimped over a pot metal bezel with cast screw threads. The slots in the bezel next to the shaft require a pronged tool that can turn the whole bezel under the cover to unscrew the threads from the switch frame.
The bezel, knob and shaft is made into a one piece assy and once unthreaded and bent end of shaft released from the slide tongue which operates the switch pulling that part out from the front will release the headlight switch from the back of the dash.
You can use thin bent end needle nose pliers or others have made a tool by cutting a slot slightly over the width of the shaft in a piece of steel just wide enough to fit the bezel openings. Once the slot is made then bend the end of the steel down so the two prongs are available. Along with the switch, here is a photo of a tool that I believe was made by Chris for use on his 39 light switch.
Attach file:
Prewar headlight switch mount.jpg (73.88 KB) prewar headlight1.jpg (228.96 KB) Bezel removal tool.jpg (23.23 KB)
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