Can't see the proof marks on the barrel flats too well, but I don't think there is a shell length marking there, and since the gun was made approx 1923 it was made for 2 1/2" shells. So I would recommend you not use Win or other standard production shells in this gun. Check out the shells from RST with lower pressures. Lower pressures don't mean less effective, just more appropriate to the age of this gun and it's original design intentions. It is Sauer's base model gun and the wear indicates it has seen substantial use. I am not an appraiser but just looking at it I wouldn't pay more than about $500 for it.
