Gun Camera, 16mm, Gun Sight Aiming Point, Type M-4A US Navy USSR and widely used on aircraft

and widely used on aircraft in the 1930s through 1950s

Pressure Indicator

We have not independently verified the information on the tag

and the right engine is on the lower scale

according to the US Air Service Command's Airborne Radio Equipment Handbook dated 1943

Gun Camera, 16mm, Gun Sight Aiming Point, Type M-4A US Navy USSR and widely used on aircraftGun Sight Aiming Point (GSAP) Cameras are electrically operated motion picture cameras which were used across US Army Air Force and US Navy fighter and attack aircraft during WWII and the Korean War. These cameras were designed to record results obtained in aerial and ground gunnery training and for producing visual records of aerial combat. By the end of WWII, the AN N6 GSAP cameras were the standard for this application. This example, the M 4 camera