Altimeter Type B-11 20K Ft, Air Force US Army UH-1 This is a Pocket Reference

This is a Pocket Reference Handbook containing 8 diagrams of the airframe stations of the US Navy's Patrol Bombers PB2Y Coronado and the PBM Mariner

US Army Air Force Type D-3

so it was likely used in a USN aircraft

The equipment is basically a 15 tube superheterodyne radio receiver with the addition of certain essential circuits necessary for radio compass operation

Altimeter Type B-11 20K Ft, Air Force US Army UH-1 This is a Pocket ReferenceThis 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. Altitude was indicated from 0 10,000 ft by the long pointer along the outer scale. As the aircraft