Aircraft Clock, Elapsed Time USAF USN MS28020LI Fairey Battle Air Corps US Army Type

Air Corps US Army Type C-13 (also AN-5760-1)

used in determining proper elevation and deflection (direction) when operating field artillery weapons

Grumman torpedo bomber Tarpon (US TBM Avenger)

the fuel quantity displayed on the main photo here is 33

25 inches square by ~4

Aircraft Clock, Elapsed Time USAF USN MS28020LI Fairey Battle Air Corps US Army TypeThis is an original Cold War era Elapsed Time Clock, made for US military aircraft applications by Elgin (MS28020LI), and as used in aircraft carrier based Grumman Cougar F9F 5 and North American Fury FJ2 Jet Fighters. See photo of the cockpit of the F9F 5 from its flight manual dated 1955, showing the location of the clock. The clock winds and keeps time a few minutes. Has not been examined for accuracy or full functionality. The dial is 1 7 8 inches