Girl Adventurers membership club badge c.1950's with additional 2 year bar

A scarce original circa 1950's period 'Girl Adventurers gilt membership club pin badge' with rare additional red enamel diamond bearing a '2'; the reverse impressed with maker's details 'F.& S.Ltd B'Ham'. Very good condition, complete with original pin fittings, an excellent example.Height approx 41mm.