This is a genuine WW2 leather frog as used with the S1884/98 bayonet, which fitted the Mauser K98 infantry rifle. This particular example is an unusual Luftwaffe issue one, dark brown rather than black, and clearly stamped LBA (Luftwaffe Bekleidungs Amt), as well as maker mark LLK and date of 1940 plus a further stamp of 64. In good used condition, nice and strong around the frog-stud hole, with loose stitching below the belt loop and one rivet missing - otherwise very good. A very nice original Luftwaffe item.