Luftwaffe FLAK Artillery Personnel's Trade Badge (Flakartillerie Tätigkeitsabzeichen). The FLAK personnel's trade badge was introduced for wear by qualified personnel on 23 July 1937, requirement criteria for award of the badge indicated the personnel must have served at least nine months in a flak unit. The badge is nicely machine-embroidered in silver-white linnen on Luftwaffe blue-grey wool. Nice example in good unissued condition!