I have there Walther PPKs. 1st. is a 7.65 (Pre WWII I believe), 2nd. is 9mm Kurz dated 1965, and the 3rd. is 9mm Kurz and is dated 1967. The two 9mm Kurz are in excellent condition and the 7.65 has some wear (see photos of all three). I'm trying to determine the value of each one. Thx so much.