Aircraft Ignition Switch AN3212-1 Bf-109 The larger buckle measures ~

The larger buckle measures ~ 2 x 4 inches

This is an original WWII-era Armament Service and Instruction Manual for the Consolidated B-24D Liberator heavy bomber of the US Army Air Force

and a recording base

which projects three lines called reticles (1 horizontal and 2 vertical)

The crown symbol of the Air Ministry can be seen stamped on the rear case

Aircraft Ignition Switch AN3212-1 Bf-109 The larger buckle measures ~This is a WWII era aircraft Ignition Switch as used in numerous single engine aircraft of the ear, such as the US Army Air Force P 51 Mustang and US Navy Fighter F4U Corsair, according to their parts lists of that era. The switch rotates to each position on the dial. Measures ~2. 5 inches diameter and ~3 inches long. The internal part of the rear connector has been removed, so this should be considered for static display or core for repair. It appears