6.7 inch you say, not a Walther PP, too small for P08 or P-38, close to a Walther PPK at 6.59".

still could be that mauser model type II 7.65 at 6.81", but then again the Sauer model 38 (H) type II at 6.69" is probably what you are looking at...the French Unique is at 7.12 " too big.

Sauer it appears to be friend ! or a post war derivitive

E