Most folks, myself included will see the 'x' and think of it as a 'russian capture' - some recent information seems to show that it is not always true. The force matching I associate more with an east german gun that was then used in service. Making sure the part worked then renumbering is how I beleive.
The toggle was likely blank or perhaps it happened to be a #31.
The frame appears to have the 'Mauser' hump or bump, which would show that it was a mauser to start with and then it was reused / rebuilt when needed.
The low serial number can just be a coincidence, as tens of thousands were made each year and they started over (2nd batch of 10,000 would have a suffix letter). Or perhaps the front of the frame and side were renumbered.
Ed
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