Annunciator, for Handley Page Victor Mk 2 Strategic Bomber Smiths Flight System
Here is an Annunciator unit, code 12.S.F.S., a component of the 1950's-era Smiths Military Flight System, as used in the RAF's Cold-War-era Handley Page Victor strategic bomber, with the civilian version used in the Britannia and Comet airliners. The Annunciator, used for the Twin Compass System, appeared just right of center on the co-pilots panel (see photo of Victor instrument panel). See photo for instructions on its use. Measures 3.25in diameter and ~3.25in deep.