Very nice zinc Erkennungsmarke from a member of the 1./SS-Panzerjäger-Ersatz-Abteilung, the training unit for Panzerjäger crews of the Waffen-SS, which means it probably belonged to a member of a PAK-Zug in one of the infantry regiments or a member of SS-Panzerjäger-Abteilung 5 "Wiking".
It was recently found in Lissyanka, where the 5. SS-Panzer-Division "Wiking" broke out of the Cherkassy Pocket on 16 February 1944. The "Wiking" division suffered heavy casualties when it broke through the Russian positions there. The tag has the typical zinc corrosion, but is still in very good condition.
A very rare tag from a very historical place.