Altimeter, Sensitive, Type C-12, 50,000 ft, US Army Air Force WWII JU-88 the tachometer is in the

the tachometer is in the middle of the second column of instruments from the right) and MIL MI-4 (see cockpit photo

as used in the US Army Air Force's Boeing B-29 Superfortress (see photo of B-29 Flight Engineer's instrument panel with a red dot showing instrument location)

but utilizes an electro-magnetic compensation system

can interpret them by rotating the card to match the arm position being observed

With a serial # AC42-670

Altimeter, Sensitive, Type C-12, 50,000 ft, US Army Air Force WWII JU-88 the tachometer is in theHere is an early WWII era Sensitive Altimeter, Air Corps US Army Type C 12, made by Conn. The C 12 Altimeter was used across all aircraft of the Air Corps US Army, including heavy bombers B 17 and B 24, medium bombers, B 25 and B 26, Fighters P 38, P 39, P 40, P 47, and P 51, and transports C 46 and C 47, according to the Maintenance Interchangeability Chart dated Dec 1943. It has a serial number prefix AF 43, evidence of a manufacturing year 1943.