On Oak Base. With plaques from the US Navy Bureau of Ordinance with serial numbers for the sight built by Eastman Kodak and the gyro unit built by Bendix Aviation Co.
This sight was used for turret gunner positions on various American aircraft like the Avenger Torpedo Bomber, Patrol Bombers and the A-26. The US Navy has declassified the manual for these units and it is available at online archives.
