US Army Air Force Fighter Gunnery, 1st Edition, Training Manual, June 1944 A-35 Vengeance as the aircraft's guns have

as the aircraft's guns have been fired

and do not see any formal labels on the device that would indicate that it was a tool sanctioned for use by US military aviators

one for Autopilot Release and the other for Hydraulic Panel Lights

Here is an original WWII-era Recognition Poster for the British Royal Air Force Avro Lancaster Heavy Bomber as published by the US Navy Dec 1942

and functions as it should

US Army Air Force Fighter Gunnery, 1st Edition, Training Manual, June 1944 A-35 Vengeance as the aircraft's guns haveThis is an original Fighter Gunnery Training Manual as used in aerial fighter combat training of pilots of the US Army Air Force during WWII. Its 115 pages cover all that is necessary to know by fighter pilots for air to air combat. It is in good condition for its age. The pages are intact. The cover has become detached from its staples, but it is otherwise reasonable condition. Measures 8. 5 x 11 in and about 1 2 in thick.