You will need a professional appraisal.
The P38 was manufactured during wartime, when simpler, less expensive ways of manufacturing things were sought out. Chrome lining - especially on a pistol barrel - would've been highly unlikely on a P38. If you have such a pistol, what you probably have is a postwar P1 pistol (aluminum slide, rather than steel), or else a P38 with a postwar P1 barrel swapped in.
£150
It would reduce it. The only way a P38 would have a chrome lined barrel would be as a result of aftermarket work, or by swapping in a postwar P1 barrel, which would reduce its value for having mismatched parts.
about the the late 1800s
10-100 USD or so
Pistol made by Hopkins and Allen @ turn of the century or before.
Serial numbers do not mean a lot- we need make and model. Also- not all revolvers with "38 S&W" on the barrel ARE Smith & Wessons- that is a caliber. And the finish is nickel, not chrome.
What is the caliber, barrel length, finish, grip material, markings on barrel?
Impossible to value without a detailed description of all features and overall condition.
Which pistol? Most production pistols have a barrel length of 1 to 8 inches.
Need to know caliber, barrel length and whether it is a revolver or semi-auto pistol in order to answer.
10-100 USD or so