Airspeed Indicator, Sensitive, 700MPH, Army Type F-1, US Army Air Force, WWII Cessna This is a Machmeter

This is a Machmeter

Here is a WWII-era Hand Bearing Compass

Two were typically mounted on each side of the aircraft forward of the wing

The knob turns and the display rotates as it should

Airspeed Indicator, Sensitive, 700MPH, Army Type F-1, US Army Air Force, WWII Cessna This is a MachmeterThe Army Type F 1 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 F 1 was made by Bendix, part number 739U 03, and has a serial