Stamp looks good, but ring material looks wrong
As far as I know, all ostfront rings are cut (or not solderes/welded)
Wir kapitulieren niemals !
Could be a ring from an EK II.
Searching for anything relating to, Anton Boos, 934 Stamm. Kp. Pz. Erz. Abt. 7, 3 Kompanie, Panzer-Regiment 2, 16th Panzer-Division (My father)