British Aircraft Corporation 1965 silver 20 year service badge

A scarce original circa 1965 aircraft engine manufacturer 'British Aircraft Corporation twenty year service badge' the reverse impressed with Birmingham silver hallmarks for 1965 and maker's details 'F&S' (Fattorini & Sons). Very good condition, complete with original screw post fixing and hallmarked silver nut, no damage to the enamel. Width 29mm. Height 13mm.