Aircraft Clock, 8 Day, Type A-13A-1, USAF 1965 Allison This is a Cabin Altitude

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

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

and is in fine cosmetic condition given its age

which appeared on the engineers panels of the Boeing B-50 Bomber and KC-97 Stratotanker

such as bombers B-24 Liberator

Aircraft Clock, 8 Day, Type A-13A-1, USAF 1965 Allison This is a Cabin AltitudeHere 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