Altimeter Type B-11 20K Ft, Air Corps US Army Martin The signal light is in

The signal light is in very good condition

but all of the pages appear in place and intact

Marine Corps Air Defense Group - 43

The WWII-era Radio Altimeter Altitude Limit Selector Switch

made by Bendix for an order by the US Air Force dated 1949 (see serial number prefix)

Altimeter Type B-11 20K Ft, Air Corps US Army Martin The signal light is inThis is a WWII era Sensitive Altimeter displaying aircraft altitude from 0 to 20,000 feet. The Type B 11, made by the Bulova Watch Company, was used in a variety of aircraft during early WWII with a maximum performance ceiling below 20,000 ft. This altimeter has a serial number prefix of AF 43, indicative of a year of manufacture of 1943. See spec sheet. ACUSARMY is imprinted on its face, for Air Corps US Army. Altitude was indicated from 0 100 ft by