Altitude and Airspeed Handset, Gunnery System B-29 Superfortress F3D Skyknight This is a Gyrosyn Compass

This is a Gyrosyn Compass Master Indicator Type C

Measures 10

They are quite difficult to find

part number 646050 to AN-5735-1 spec

changes the barometric display

Altitude and Airspeed Handset, Gunnery System B-29 Superfortress F3D Skyknight This is a Gyrosyn CompassHere is an original WWII era Altitude and Airspeed Handset as used in the Boeing B 29 Superfortress bomber. This was a module of the B 29's Central Fire Control System, the remote control gun turret system. This critical component was installed at the Navigator's station in the B 29 (see image of the station from the B 29 flight manual. Handset is at the bottom of the photo). It was his responsibility to ensure that the dials on the handset for