The pistol appears to be in very good condition; I would estimate it at about $800. I would like to see pics of the numbers on the magazines.
I agree with this estimate. On top of the condition and the spare magazine, the gun has the red mottled grip type which is more sought after than the standard dark brown. I am not sure but they do seem to also be the less common grip type as well. At $800 I'm not so sure it would sell instantly, but someone would come along who liked the originality, condition, grip type, spare original mag etc that this package would offer. Many times a P38 is mismatched, imported, dipped, with a post war mag and replacement grips, to give an idea and many times still $400+ but anyone can ask any selling price they want.