Mike. Thank you for your reply. The feuerbixler site looks as if it is a good one but my German is not up to translating it.
An Internet search suggests that the Wehrmanns Gewehr originated after WW-1, in response to the firearms restrictions contained in treaty of Versailles, and continued to be used until the end of WW-2. They were used primarily for civilian target shooting and generally were set up with a wood loading tray to be used as single shot rifles. It may be that they were all used as single shot rifles and didn't use the magazine when chambered for the 8.15X46R cartridge.
Neither the barrel or action show any evidence of having any markings removed. I guess that the barrel proof marks could be under the rear sight base. Would the #5 on the action side or any of the markings under the action identify its maker?
Otto