St.Kp./G.E.u.A.B.76 Erkennungsmarke (NL/Ger)

The dog tag or 'Erkennungsmarke' shows normal signs of wear. The Infanterie Ersatz Bataillon (motorisiert) 76 was formed in the summer of 1939 and supplied men to the 20.Infanterie-Division from the beginning. (This division started the war in the Belgium, then France and from 22 June 1941 it participated in operation Barbarossa. It fought the rest of the war in the east)
In October 1943 the ersatz bataillon was renamed in Grenadier Ersatz und Ausbildungs Bataillon (motorisiert) 76. In September 1944 the bataillon moved to the Netherlands were it became part of the 190.Infanterie-Division and became the II.Bataillon of Grenadier Regiment 1224. This regiment fought in the last months of 1944 in the area of Kleve and in the beginning of 1945 in Venlo. 
The ersatz bataillon was reformed again in December of that year in Germany as Panzergrenadier-Ersatz- und Ausbildungs-Bataillon 76 and was mobilized, in April 1945 as part of the Panzer-Ausbildungs-Verband Ostsee and renamed into Panzergrenadier-Ausbildungs-Bataillon 76.  
A Stammkompanie was a unit that trained the soldiers. Often the soldiers of this companie were soldiers who had frontline experience, but no longer were fully usable on the front due to injuries. Of course this changed later in the war and they also where put into action as there was a shortage of (front)soldiers.
The 'AB' on both parts of the tag stands for the soldier's bloodtype.