Radiological Survey Meter (Geiger Counter) CDV-715 Model 1A F9F Panther shows evidence of this clock

shows evidence of this clock having been through NAS (Naval Air Station) Norfolk (VA)

and all components may not be present

The knob rotates the barometric pressure adjustment

WWII-era US Navy Douglas SBC Dive Bombers as well as early 'birdcage' versions of the Vought F4U-1 Corsair Fighter

The KB-29P (116 of them) were created starting in 1948 from modified B-29 bombers

Radiological Survey Meter (Geiger Counter) CDV-715 Model 1A F9F Panther shows evidence of this clockHere is an authentic Geiger Counter as used by the US Civil Defense, plus original instructions. Operational condition accuracy is unknown. With a D cell battery installed, the meter needle activates when switched on.