This is an aluminum WH (Heer) ID-disc (Erkennungsmarke) as intended for a member within the '4./Schw.Art.Ers.Abt.mot.59' - '4. Schwere-Artillerie-Ersatz-Abteilung (motorisiert) 59'. The disc also bears the soldier's blood-group (type: 'B') which has been clearly imprinted on the front of the disc. The disc is in uncleaned condition as found. Nice original ID-disc in good used condition!