Your barrel has been cut off and refinished. I'm willing to bet if you look inside the cylinders you will see a ring where it has been reamed for the .38 special cases. If it says .38 S&W CTG on the right side of the barrel, you probably have a British lend-ease pistol. On the left top-strap it should have a U.S. Property marking (or maybe machining marks where it was ground off)

I swear I just saw it's twin in a pawn shop near Atlanta last week. Hmm.