here are two other Sauer&Sohn

this one was heavy reworked, maybe barrel drilled out for 9,3x57 from 8x57I or 9x57

SN 180323

here SN 208120 in 8x57I

I think they had an own style.

the serial numbers don't mean they make 208120 Mauser hunting rifles. most of them are shotguns and combinations guns because the numbers goes continuously no matter what a gun it was.

again,your rifle with the other

looks like Sauer &Sohn