It appears that I (and apparently others as well) have made a poorly founded assumption, based on many examples of the well known 3 ring Krupp logo. I have three examples of the above 4 ring logo, all on post war J P Sauer guns, one dated 1957 and two dated in 1956. The logo stamps are all as per the photo above. I simply assumed that, since the famous 3 ring logos were Krupp, this 4 ring mark was as well. But, NONE of them say Krupp!! Since this was after the Russian take-over of the Suhl gun making factories, I believe I'll now go with the WAG above made by Raimey, which attributes the steel and the marking to a Russian variant, or counterfit of Krupp.
I also remember another German logo with 4 rings: Auto Union. That might have factored into my initial belief this marking was a genuine German (Krupp) mark, although the Auto Union 4 ring logo is straight horizontal.
That likely makes the values of post war Sauers even lower, at least IMO. I have shot this steel, and it handles modern loads well, but I also don't think this is a Krupp product. That'll be my stand until proven otherwise.
