I just acquired this K38 from ~1972 (3K7505) that has the SN stamped on the barrel flat. It's my understanding that this was deleted, along with the # on the rear of the cylinder after ~1960, but for a few reasons, as enumerated by Hondo44, the SN does appear in those locations on into the 1960's and possibly beyond. Another feature is the standard width trigger is not serrated. The case colors indicate to me this was NOT done after it left the factory.
Another thing the gun has is the hammer stud, inside the frame, has 11 punch marks around the perimeter of the stud which makes me think the stud had a fitment problem at the factory and the punch was used to better secure it to the frame. There are no rework marks, so over all it looks like the factory saw a problem and continued massaging it until it pasted final inspection.
It also has the red square on the rear of the Patridge sight, but that is not unusual for target guns of this vintage.
I will post pictures of this high condition K38 a little later (after I put it back together) but for now I will invite any comments on the barrel flat SN and this hammer stud..
Another thing the gun has is the hammer stud, inside the frame, has 11 punch marks around the perimeter of the stud which makes me think the stud had a fitment problem at the factory and the punch was used to better secure it to the frame. There are no rework marks, so over all it looks like the factory saw a problem and continued massaging it until it pasted final inspection.
It also has the red square on the rear of the Patridge sight, but that is not unusual for target guns of this vintage.
I will post pictures of this high condition K38 a little later (after I put it back together) but for now I will invite any comments on the barrel flat SN and this hammer stud..