Oxygen Master Regulator Mark X, British RAF, 106D/24, For Parts or Repair SN172 TBM Avenger It is clearly 'experienced' but

It is clearly 'experienced' but the dial markings are clear and the glass and case are intact

This is an original Pilot's Handbook of Flight Operating Instructions for the US Navy's TBM-3 Avenger Torpedo Bomber

WWII-era US Navy Douglas SBC Dive Bombers as well as early 'birdcage' versions of the Vought F4U-1 Corsair Fighter

which appeared on the right side of the instrument panel (see photo from the WWII C-47 Pilot Training Manual showing its location)

It may be some sort of a stall warning instrument

Oxygen Master Regulator Mark X, British RAF, 106D/24, For Parts or Repair SN172 TBM Avenger It is clearly 'experienced' butThis WWII era Oxygen Master Regulator Mark X was used in large bomber aircraft of the British Royal Air Force and Royal Canadian Air Force, such as the Avro Lancaster. The Mk X regulator was for a high pressure continuous flow oxygen system and allowed the pilot to control the flow of oxygen centrally for up to 8 crewmen. The left hand knob controlled the flow of oxygen, which would be displayed on the ALT gauge. The flow was to be set to match the