Compass, Aperiodic, US Navy Aviation, 88-C-845 (Type D-12)- 2 Seagull The threads that would capture

The threads that would capture the retaining ring may require filing for a smooth fit

Measures 6 x 8 inches

The knob in the lower left corner adjusts the altimeter for the barometric pressure

It has a serial number prefix AF-43

Compass, Aperiodic, US Navy Aviation, 88-C-845 (Type D-12)- 2 Seagull The threads that would captureThe US Navy 88 C 845 (USAAF Type D 12) Direct Reading Aperiodic Navigational Compass was used at the navigators station across many US Navy WWII aircraft, including patrol bombers PBY Catalina, PB2Y Coronado, PB4 Privateer, PV 1 Ventura and PV 2 Harpoon. Made by Bendix, part number 1828 1 A. The navigators' direct reading compass is known as an aperiodic (without a period) compass, since the needle returns to rest quickly and without appreciable