It is stamped ".38 S&W CTG" (CTG is an abbreviation for cartridge). Therefore it is the British .38/200 version. Time for caution, for several reasons. First, many of the .38/200s had their chambers lengthened after the war to accept .38 S&W cartridges. It works, but any collector value vanishes and it becomes just a shooter worth whatever anyone is willing pay for it. Second, even if has not been altered, .38 S&W ammo, while still loaded, is difficult to find and quite expensive. Think $1 per round. It's not a revolver that anyone who plans to shoot much needs, unless the "anyone" plans to reload. The US version in .38 S&W Special is much better for anyone who wants to shoot much. The finish appears to be not so hot. If you are contemplating purchase, you need to establish if the chambers have been altered or not. If so, avoid. Second, I wouldn't make much of a monetary investment in it, given its condition and caliber.