Robertsons 1980 Golly policeman advertising badge protruding bobble

A scarce original 1980's 'Robertson's Golly policeman marmalades and Jam promotional badge', this example with protruding bobble the top of his helmet, the reverse impressed with maker's details '©James Robertson & Sons Ltd.'. Very good condition, complete with original pin fittings, safety roller catch in good working order, no damage to the painted enamel finish. Height 31mm.