Thanks alot Herr Kaiser!
The 1908 belonged to the grandpa of my friend...unfortunately (luckily for me) he has no license to own guns.
His grandpa carried this 1908 (together with the Mauser 1910/34) in WWII, in a 1940 leather holster. That explains why it has the wrong magazine.
Unfortunately the 1908 was stored in the leather holster so the finish suffered...
I wish it would be possible to post larger photos, I had to compress them alot. Hopefully they are not too small.