THANKS Marcus! Have you seen my new pics above? When did the BBF come out? I have some early (teens) J.P.Sauer Katalogs and they dont have any BBF's listed! How about the 7x57R,when did it emerge? Schrote chamber may have been modified previous to my having the gun but it is right at 70mm. Love to hear comments on above markings,I hope I am missing some good clue! Kevin.