The US Army Air Force Type D-12 Direct Reading Aperiodic Compass was used at the navigators station across many US WWII aircraft, including heavy bombers B-17, B-24, B-29, medium bombers B-25 and B-26, and transports C-46, C-47, and C-54.  Made by Bendix, part number 1832-1-A, it has a serial number prefix of AF-45, indicative of a manufacturing year 1945.

The navigators' direct reading compass is known as an aperiodic (without a period) compass, since the needle returns to rest quickly and without appreciable overswing when deflected from its position. 

This compass does work and is mounted on a board for display purposes.