Altitude and Airspeed Handset, Gunnery System B-29 Superfortress F3D Skyknight part number 646050 to AN-5735-1

part number 646050 to AN-5735-1 spec

They are quite difficult to find

This model has two adjustable vanes (peep and far) with prism for viewing compass bearing and spirit level

25 inches diameter by ~ 4 inches deep

this instrument was used in aircraft such as the Bf109G

Altitude and Airspeed Handset, Gunnery System B-29 Superfortress F3D Skyknight part number 646050 to AN-5735-1Here 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