On the Sauer, made in Germany, with „VORM. J.P. SAUER & SOHN-SUHL“, on the tubes with the 4 Ringes, I am told this was the West German true J.P. Sauer so if both East & West German Gunmaking centres were using 4 Ringe Spezial Gewehr Läuf Stahl, then maybe Bochum Verein was the culprit?

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Hochachtungsvoll,

Raimey
rse