Re: Couple of old gun questions.
That pistol was made by Walther (code ac), the original designer/manufacturer in 1941, before quality began to deteriorate. It is the 4870th pistol made in 1941, so it is quite early in the year. In nice condition, those bring $1200 or so, but that one shows some rust and was not well cared for, but even so should bring around $800. Maybe others will have better ideas on value, and cite on-line auctions, but two guns are seldom the same, so just looking up what "a P.38" sells for is not very indicative of what another gun might bring.
As noted, the original holster and magazines, if available, will add more.