Thought I'd bump this as I have the same question. I ordered a few firearm value books off of Amazon today, but was hoping to get up to speed before they are delivered next week.
A guy I work with brought me a Walther P38 9mm that his great-uncle brought back from the war. Its been sitting in his closet collecting dust (he's only fired it once years ago) and he knew I'd appreciate it. Markings on the grip and receiver are a match, it was made in 1942 as a P38 AC series (ac/42 stacked), eagle and number 359 carl Walther proof stamp, high serial number ending with letter "k". Overall good shape, certainly has seen use with a little rusting on barrel and a scuff mark where the thumb groove lies next to the receiver release switch. I figured $600 was top fair market value, but with these kind of specs should i offer closer to $400?
If I do buy it, do I need to register it or anything? New to collecting vintage firearms and looking to make sure everything is taken care of.