Very nice. What you have is a Unique Model 17 that was manufactured for the German Wehrmacht during the WWII Nazi occupation of France. Chambered for the 7,65mm (.32 ACP), this pistol is a blow-back operated pistol with a concealed hammer (the similar "Kreigsmodell had an external hammer). The right rear receiver has the correct Nazi Army acceptance mark - Eagle/WaA251 and the barrel has the Nazi test proof.
The right grip is properly marked "7.65mm 9 Schuss" (German for ".32 ACP 9 Shot") however, the left grip should say "7,65mm Unique" - so that might be a replacement. It appears to have the correct/original brown leather holster - is there a Nazi acceptance Eagle/WaAD20 on the flap?
Despite the bluing loss on the slide, I wouldn't be surprise to see that rig go for $500 plus on the auction boards.
Congrats!