BOAC Airline air steward or stewardess gold bullion brevet badge

A scarce early original 'British Overseas Airways Corporation Air Steward or Air Stewardess BOAC brevet badge', gold wire embroidered black felt padded wing, the central letter 'S' on blue ribbed ground, encircled by a double rope edge, the reverse with black hessian waxed backing. Good condition, bullion dulled. Width 51mm.