"Feldpost" cover/label - Pz.Gren.Rgt.129/115? - Maljni?

Unusual linen "Feldpost" cover/label of "Obergefreiten" Maljni? who served within Pz.Gren.Rgt.129 or Pz.Gren.Rgt.115 (depending on its date?

Code: 54707