Aircraft Clock, 8 Day, Type A-13A-1, USAF 1965 Allison such as bombers B-24 Liberator

such as bombers B-24 Liberator

The knob rotates and the card turns as it should

as evidence by the fluid line across the face between 330 and 30 degrees (see photo)

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This is a Cabin Altitude and Differential Pressure Indicator as used in USAF's Cold-War-era Fighter/Interceptor F-89 B Scorpion

Aircraft Clock, 8 Day, Type A-13A-1, USAF 1965 Allison such as bombers B-24 LiberatorHere is a fine specimen of a mechanical 8 day Aircraft Clock Type A 13A 1, made by Waltham Precision Instrument Company, part number 40091 with a manufacturing date of May 1965 for an order by the US Air Force. The A 13A 1 was used in a number of different aircraft during the 1960's and 1970's, including bomber B 52 Stratofortress, fighters F 100 Super Sabre and F 86 Sabrejet, and the trainer T 33. From the Waltham Clock website: With one hour elapsed