Airspeed Indicator, Sensitive, 700MPH, Army Type F-1A, US Army Air Corps, WWII F-89 It is in fine but

It is in fine but 'experienced' condition for its age

Mach speed is indicated from 0

This indicator was positioned at the Turret Trainers Station within a gun turret of a battleship or a cruiser

The knob adjusts the indexing 'aircraft' within the dial to align the perspective of the pilot to the horizon indicator

Airspeed Indicator, Sensitive, 700MPH, Army Type F-1A, US Army Air Corps, WWII F-89 It is in fine butThe Army Type F 1A 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 1A was made by Kollsman, part number 739U 03, and has a