Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Corps, WWII C-47 such as the Grumman fighters

such as the Grumman fighters Martlett (US F4F Wildcat) and Hellcat (US F6F)

Used to alter the Heading Index

The inside of the glass could use some cleaning

It also includes diagrams of instrument panels of specific aircraft showing the location of these instruments

Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Corps, WWII C-47 such as the Grumman fightersThe 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. The text "AC