Altimeter, Sensitive, Type C-12, 50,000 ft, US Army Air Force WWII P-40 according to their Maintenance Interchangeability

according to their Maintenance Interchangeability Chart dated Feb 1945

as appeared in dual engine aircraft such as the US Air Force attack bomber Douglas A-26 / B-26 Invader during the 1950-70's

The rear housing has rusted

It was the forerunner of the Bendix Polar Path and Sperry CL 11

Altimeter, Sensitive, Type C-12, 50,000 ft, US Army Air Force WWII P-40 according to their Maintenance InterchangeabilityHere is a WWII era Sensitive Altimeter, Air Corps US Army Type C 12, made by Kollsman. 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. The C 12 Sensitive Altimeter displayed altitude using 3 pointers. The first and