Hi webhak,
what you have is Sauer & Sohn model "Tell" (more precisely: "Tell-Büchse" = Tell rifle). There were two variations; you have the better one with detachable barrel (the screw lever on the left). Turn it to the left for some revolutions and you can take the barrel off from the action.
Please do so: as already mentioned, there you'll find (probably) more markings, like the proof date and so on.
Are you sure about the calibre? Very unusual for a Tell. I liked to see a photo of the calibre markings.
Regards
Martin
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