Guys, Josh posted once nearly six years ago and hasn't been heard from since
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He stated the original gun was stamped ".38 Smith & Wesson CTG", and the photo is too blurry to confirm this. (I think it has .38 S & W CTG on the right barrel, but am not sure.) If so, this detail and the SN likely make it one of the early British contract .38/200s from about 1940. It is probably missing the butt swivel but we can't ask him.
Also, best to post new questions on new posts...just go to the proper section of the Forum and click on New Thread at the bottom, then type away.