Nottinghamshire Constabulary police helmet badge c1953 to 1968

A scarce original circa 1953 to 1968 period 'Nottinghamshire Constabulary police helmet badge', large chromium plated Elizabeth II crowned star, with raised blue enamel title surround and 'EIIR' to centre, the reverse with single central screw fittiing, retainer now absent. Good condition, some enamel loss and dent to title surround. Height 122mm. Diameter 58mm. Nottinghamshire Constabulary established 1840. it amalgamated with Nottingham City Police to form Nottinghamshire Combined Constabulary in 1968.