Stammbattr.s.Art.Ers.Abt.63 EKM (Landsberg)

The dog tag or 'Erkennungsmarke' shows normal signs of wear. It belonged to a soldier who served in the Stammbatterie Scwere Artillerie Ersatz Abteilung 63. This abteilung was formed in August of 1939 in Landsberg/Lech. It trained and delivered soldiers for different Heeres-Küstenartillerie-Abteilungen and Regiments, Artillerie-Abteilungen and Regiments and Gebirgs-Artillerie Regiment 79. 
In late oktober 1944 the abteilung was responsible for forming the V.Abteilung of Volks-Artillerie-Korps 388. This abteilung was equipped with 12 x 15-cm schwerer Feldhaubitze and was part of the 2.Fallschirmkorps and during the Ardennes Offensive it was part of the I.SS-Panzerkorps. 
A Stammkompanie was a unit that trained the soldiers. Often the soldier of this kompanie were soldiers who had frontline experience, but no longer were fully usable at the front due to injuries. Of course this changed later in the war as there was a shortage of (front)soldiers and where mobilized also.
The 'A' on both parts of the tag stands for the bloodtype of the soldier.