No markings. Dark brown with silver top. Friction mount. Note these have a 'blueish' silver top.
vintage control knob amplifier radio tv 6mm D-shaft brown / yellowy silver
Black amplifier control knob pointer barrel 6mm vintage style set screw klon
26mm black silver top amp knob fluted volume amplifier radio control knob 1 inch
33mm Large black silver top amp knob volume amplifier radio control knob FAC
20mm off white silver top amp knob fluted volume amplifier radio control knob
Fluted Retro Silver Cap Amplifier / Instrument Control Knob - 6.4mm Round Hole
