So I've got this old gun... (Mauser Mod98k BYF41 all matching)

[da gimp]

k for kurtz (short)

[Johnny P]

Make that kurz as in 9mm Kurz.

As Dave explained, it is not hard to tell original from renumbered parts, and on the early rifles virtually every part had the WaA stamp. On this early rifle even the locking screw for the trigger guard screw is marked with the acceptance mark.

Also, here is a picture of the stock with the P, the serial number, and the acceptance marks.