LBA is not stamped since 1940 but the design is clearly LW. there were normal separately marked contract for LW and Marine on Kar98k, since late 1940 or 1941 it was changed that only Heer was probably stamped. On LW frog of this type You will never see a secure strap which was applied by mounted units and by Heer since 1936, short stitch was enough for them probably for fixing the both layers of leather as the side stitches are complete and 4 rivets should be there. Certainly there exist origin papers for extra contracts for LW. Why this was we dont known, but LW marked units prior 1939 still exists, which by Heer was already 1936 declared as obsolete. LW was allways a extra branch under Reichsmarschall H.G. influence, certainly with some links to friends or own industry.