Get several good photo's and post them over at the p38forum,com forum site and those fine fellows can tell you everything you want to know and then some.
I inherited my Dad's P-38 and after posting the photo's I learned a lot, so much I downloaded and printed the photo's and all the comments and but the package in a binder for the next of kin who gets it after me...lays out the whole story and history of this particular WWII P-38...the information they provided was just amazing. And they advised me of it's value.
Mine is not a collectors piece, roughly made cyq , refinished , imported from Russia back to the US and sold through Klein's mail order house...in 1961 it was legal, I remember the postman bringing the box to our house.
It's a fun shooter and brings back memories of my Dad.
The issue grips are usually valuable, Altamonte has real walnut replacements that look and feel great and are very reasonably priced. The ones I got look just like the factory only walnut. I put the issue grips away and shoot with the Altamont's .
If you want to shoot it Wolff makes replacement recoil spring kits , extra magazines are available and I've worked up some nice easy recoiling loads for mine. They are a lot of fun....nice score,
Gary