Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Force, WWII F-80 The 7-component Flux Gate Compass

The 7-component Flux Gate Compass system was designed to provide accurate navigational guidance using the earth's magnetic forces by minimizing interference from the systems of the aircraft

a more powerful-engine revision of the iconic WWII B-29 bomber Measures

made by Avien

It has two markers

The letters AC US ARMY are embossed on its face

Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Force, WWII F-80 The 7-component Flux Gate CompassThe Army Type D 7 Airspeed Indicator was used across a number of US Army Air Corps and Air Force aircraft during WWII, including heavy bombers B 17, B 24, B 29, medium bombers B 25 and B 26, as well as light bomber A 20, according to the Accessories Interchangeability Chart dated Feb 1945. It was also used in versions of US Army Air Force WWII fighters P 38, P 39, P 40, P 47, and P 51. This D 7 was made by Kollsman, part number 586BK 028, and has a