Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Force, WWII F-80 It has two markers

It has two markers

There are some markings on the glass denoting the operating limits and orientation of the glass (the white mark

and releases it when pulled out

The letters AC US ARMY are embossed on its face

made by Avien

Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Force, WWII F-80 It has two markersThe 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