Made at the Sauer facility more than likely with imported tubes. I've seen the encircled monogram many times on the early longarms and think it may belong to a Funk. But the "Caveman" with a "Staff" is pure Sauer.
Large and small crowns on the water table denote shooting performance and quality. Most crowns I've seen were on the flats. The Imperial Eagle holding a sword in the right talon and an orb in the left talon, if I remember correctly, is either a Sauer inhouse pre-1893 proofmark or an arsenal mark that I've seen only on Sauers. From Stephen's compilation of serial numbers, which I don't have at my fingertips at the moment, you can get a best guess of a manufacture date. Looks like Sauer sourced the action work, or the wholesaler subed the action work, to the craftsman "AW". Sauer was sourced but I can't say if Eduard Kettner was the wholesaler or not.
Kind Regards,
Raimey
rse