Russian capture with Simson Toggle

[Alister]

Hello everyone! I finally got my first Luger and I've already got a few questions about it!

1. The side plate has been force matched to read 31 and the take down lever is hard to read (I'll just assume it's not matching). But every other I've looked at besides the grips match with the number 31. This a pretty low serial number so I was wondering if all the 31 stamps are a German font or a Russian font? It would seem odd that they would force match a 31 on the side plate if they've stamped 31 everywhere else and to match so many pieces us pretty rare for Russian captures.

2. The toggle is a Simson but is every other piece Mauser? I'm guessing so due to the 42 stamps and Eagle 63. The toggle number matches the frame though so I'm not sure how that worked.

Any help would be appreciated! I know Russian captures aren't that collectable and they did a lot of work on what they captured but I'm really curious to hear what you all think.

Thank you so much!