Hi i was wondering if anyone could help me, i have a walther pp serial #=380XXXP it has two eagle over n proofs ( on slide and chamber ) and one eagle over J ( on barrel) , it also has the WaA359 proof in 2 spots. its an acp. It has black grip . For some reason it has no labels on the left slide, not even the walther logo. I guess im just wondering what the value of this gun would be?