Beam Compass Indicator Smiths Flight System, 65 SFS RAF Avro Vulcan, HP Victor Sunderland the faceplate rotates to indicate

the faceplate rotates to indicate the selected frequency within the small metal frame (to which a small lamp could be affixed for illumination)

so it was likely made for a Navy version of the C-121 (R7V-1) or another US Navy aircraft

as well as civilian aircraft DeHavilland Comet and Vickers Viscount

was electrical

indicators or in the instrument panel of the rear cockpit seat for two seat aircraft

Beam Compass Indicator Smiths Flight System, 65 SFS RAF Avro Vulcan, HP Victor Sunderland the faceplate rotates to indicateThis is a Beam Compass Indicator, one of 6 indicators in the Smiths Flight System, made in England by Smiths Aircraft Instruments (part code 65 SFS). Used in 1960's era aircaft such as the RAF V bombers Avro Vulcan (see photo of Vulcan instrument panel) and Handley Page Victor, as well as civilian aircraft DeHavilland Comet and Vickers Viscount. The Beam Compass functions features are as follows, and correspond to the number call outs in the