Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Corps, WWII
The 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 Pioneer, part number 1426-4H-A7.
It is in good condition given its age. The dial and glass are intact. Measures 3.25 inches diameter and ~ 2.5 inches deep.