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 Kollsman, part number 586K-026, and has a serial number prefix of AC41, indicative of a 1941 manufacturing date. On its face is embossed AC US ARMY, for Air Corps US Army.

It is in good condition given its age.  The dial and glass are intact. Measures 3.25 inches diameter and ~ 2.5 inches deep.