Hepolite For Speed piston engine manufacturer advertising badge c1950s

A scarce original circa 1950's period 'Hepolite For Speed salesman promotional badge'; gilded brass wing the centre depicting a stylized piston on scarce white enamel ground within title surround; the reverse with maker's details 'Hepworth & Grandage Ltd Bradford'. Good condition, complete with original buttonhole lapel fitting, no enamel loss but does have some hairline cracks. Width 44mm.