This is the upper half of a Luftwaffe ID-disc (Erkennungsmarke) as intended for a member within the '6.Flak.Regt.4' - 'Flak-Regiment 4'. The disc also bears the soldier's blood-group (type: 'O') which has been clearly imprinted on the front of the disc. The zinc type disc is in uncleaned condition as found. Original ID-disc in good used condition!