Unless you can proove it was associated with that sick bastard, and prove it, then the value is that of a French Guild gun. Good condition 500-700. Now if you can find a newspaper article with photo showing that sick bastard presenting that gun to some nazi "hero" some Nazi memorabilia collector might pay a lot more.

The person that was given to was not a famous or high ranking person. For that they never would have used a French Guild gun. It would have been a German made gun for propaganda reasons.