I recently came across an old German DWM .30 Luger, not 9mm, which i believe was captured during wartime for it was found in a box in the attic of my grandfather. All numbers on all pieces of the gun match, a small "m" looking symbol is seen under the barrel and around the trigger. (mauser?) it was made in germany for sure. im curious as to how much it may be worth and where i can go to sell or appraise such an item as it was not with any registration papers or anything. any help?!?!?!