Oxygen Master Regulator Mark X, British RAF, 106D/24, For Parts or Repair SN172 TBM Avenger According to the manual

According to the manual

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

27003) lit up

This unit has service labels from Hill Air Force Base

and has a serial number prefix of AF-51 indicating a year of manufacture of 1951

Oxygen Master Regulator Mark X, British RAF, 106D/24, For Parts or Repair SN172 TBM Avenger According to the manualThis 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