Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Force, WWII F-80 Measures 3 inches diameter and

Measures 3 inches diameter and 1 inch deep

This indicator has a service label of Naval Air Station (NAS) Alameda CA dated 1967

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

although they typically attempted to dive as steep as 90deg

It has two markers

Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Force, WWII F-80 Measures 3 inches diameter andThe 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