National Benzole Mixture petroleum large pin badge

A scarce original circa 1945 -1950's 'National Benzole Mixture pin badge'; large chromium plated circular example depicting the Mercury's head logo in black and gold enamel, the reverse with maker's details in relief 'Fattorini & Sons Ld Bradford Works B'Ham'. Good condition, complete with original pin fittings, no damage to the enamel, minor surface scratch marks Diameter 38mm.