I'll get some good pics of that area, because everything else on the pistol indicates that it was made new as a commercial, not rebuilt to be. It would be good to know. BTW, the magazine turns out to be the original. I didn't know it had 'GERMANY' on the wood base until I saw the one on GB then got out the loupe to check.
As for magazines, I had several good new ones when I had the Luger I got from Tom, but sold them after I traded off the Luger for a Hi-Power.
Let me know if you need more/different views - I have a few more shots.