maarder; I notice your English seems to be in order, so I give my second reply here instead of trough e-mail.
I'm no expert compared to the more experienced collectors in this forum, but I think I manage to put a date and manufacture on the pieces in this puzzle trough the PM I sent you earlier.
Glad you got interested in Lugers
For many of us, it's not how well it performs as a firearm that got us interested. But the fascination of the high quality handcraft and history that lies behind them, also a reminder of dark chapters in human history that shall not be forgotten.
Yours is a mix of various parts and manufactures, but that does not mean it has a lacks history. The barrel for instance, comes from a ww1 Luger, banned by the Treaty of Versailles and somehow mated with ww2 area Luger frame and upper. Just the fact that parts produced almost 30 years apart and from different manufactures can be put together is fascinating. No other firearm I know of has such tight tolerances.
Then there is the personal story that comes with it.. Since it's a family piece and you are not trying to sell it, I'm no person to deny it. One way or the other it was put together, but from a collector’s point of view, the odds that this was done by the wehrmacht is slim.
Wish you welcome and hope you stick around!
btw. your magazine seems to have an interesting non-blued 'shell'. Perhaps the mag bottom is the next to investigate?