I agree with SDH. This rifle has lots of character! And as Michael Petrov has stated the commercial Mauser s/n will be on the receiver flat just behind the lug. (stock must be pulled to see it)
Interestingly, I have recorded a J.P. Sauer-Mauser with s/n of 133,475 and with a Mauser S/N of 13362 (Mauser action produced 1906). If you get the chance, please post the Masuer S/N on this rifle so that I can add it to my Sauer research information. (I'm guessing here but the Mauser s/n will likely only be a few digits away from the noted number of 13362. let us know!) best regards, J.Stephens
