One of our Merry Band has published this:
https://shotguncollector.com/2019/01/22/%d0%bc%d0%b8%d1%84%d1%8b-%d1%80%d0%be%d1%81%d1%81%d0%b8%d0%b9%d1%81%d0%ba%d0%be%d0%b3%d0%be-%d0%be%d1%80%d1%83%d0%b6%d0%b8%d0%b5%d0%b2%d0%b5%d0%b4%d0%b5%d0%bd%d0%b8%d1%8f-%d1%82%d1%80%d0%b8-%d0%ba/
>>It is an early post WWIi Sauer made of old Sauer components. The real J.P. Sauer was in West Germany by now. It wears the 4 Ringe Steel Stamp that was supposed to ride on the coat-tails of the Krupp 3 Ringe Weapons Grade Steel that Sauer had the exclusive right to make tubes and fit to their receivers. This was just an attempt to mimic the 3 Ringe Steel and assure the end user that the tube steel was quality. But there are 2 schools of thought on the 4 Ringe steel. One is that bar stock was sourced from Russia as circa 1953 the mechanics in Suhl all but revolted due to lack of quality components to make their wares. They were making reparation lonigarms and had used up all of their pre-WWII stock. The clues for the source of the 4 Ringe Stahl came from a Russian and now I think those sources have all passed. The new Russian research group gives that the 4 Ringe Stahl did not come from Russia but cannot say just where it was sourced. So the steel would have to be analyzed and compared to other similar steel recipes of the time. But who wants to lop off a couple inches of their tubes for the analyzation?
The longarm passed thru the Suhl proof facility in May of 1957 with 70mm chambers & Nitro proof. To be honest it looks like the tubes wear earlier German proofs higher on the tubes. Maybe the mechanics didn't know exactly what steel it was & conjured up the idea of the 4 Ringe Stahl & stamped it on the tubes? But for the pre-WWII Krupp steel, there were strict rules regarding what was to be applied to the tubes. There was an agreement between the steel maker & the mechanic making the tube on the specific text that was to be applied.<<
>>I have read that the 4 Ringe Spezial Weapons Grade Steel was a Bochum Verein recipe??<<
>>After doing some deep diggin', and considering this example and others from the period, it appears that putting the Vier Ringe Spezial Stahl stamp on a tube may have been a veiled attempt to mask the actual tube steel as Krupp as banned post 1945 & the West German makers held fast with the rules. But in East Germany it appears the mechanics were either a bit more devious, forced to be such, but if something like Krupp steel or bar stock with which they were unsure, they just slathered Vier Ringe Spezial Stahl on it & sent it on. Too, it is possible that the ban on Krupp Steel was circumvented and remembering that Krupp up to WWII did have 4 different types of steel, that the odd Vier Ringe Spezial Stahl stamp was applied?<<
https://www.shotgunworld.com/threads/jp-sauer-sxs-12-gauge.547473/Hochachtungsvoll,
Raimey
rse