Jerry is spot on and even taking the Sauer patent date would not narrow the date range. But, but seeing that there was quite a bit of effort from the Sauer concern with the 3 Ringe Spezial Gewehrlaufstahl tubes, there might just be a Sauer serial number of datastring either on the lower rib or on the tubes between the flats and the forend hanger.



Ads for the 3 Ringe stahl seems to appear circa 1895. It wears a unique/early 3 Ringe Spezial Gewehrlaufstahl stamp atop the tubes. That coupled with the "Crown" over a Gothic "F" as a volunteer semi-smokeless proof makes it an interesting piece. Sch. P. - Was it Schultze or Schwarzpulver?




1907/1908 advert

http://www.deutsches-jagd-lexikon.de/index.php/Nimrod-Gewehrfabrik

Kind Regards,

Raimey
rse