Heer Erkennungsmarke St. Beob. Abt. 28

Typical Erkennungsmarke or ID disc marked St. Beob. Abt. 28 indicating  Stab. Beobachtungs-Abteilung 28 which was under the 28 Infanterie Division which fought on both fronts and was in Laon, Normandy when the allies invaded.