Aircraft Clock, Elapsed Time USAF USN MS28020LI Fairey Battle the fuel quantity displayed on

the fuel quantity displayed on the main photo here is 33

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

this instrument was part of the Siemens K 4ü course control system

So it is possible that there is some connection there

indicative of a manufacturing year 1943

Aircraft Clock, Elapsed Time USAF USN MS28020LI Fairey Battle the fuel quantity displayed onThis 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