zonker5 is on the right track. I have seen many of these. They were orginally chambered for .38 S&W, not .38 S&W Special, had 5" barrels, and were sent to England during WW2. The crown markings are British proofmarks. Later, they were surplused, cut back to 2", bored out to accept .38 Special ammo, refinished, and re-imported to the US.
There are a couple of problems with these conversions. First, shortening the barrel removed the barrel lug in to which the ejector rod used to lock. This marginally weakens the lockup of the cylinder -- whether or not this is really significant is a matter of debate. Second, as the original .38 S&W is slightly larger in diameter than the .38 Special, the chambers and bore are slightly oversized for .38 Special, leading to bulged and sometimes split cases upon firing and mediocre accuracy when firing .38 Specials. Certainly,all collector value is eliminated, and even shooter value is reduced.
If you shoot .38 Special in this gun,stick to standard-power loads, for sure, no +P, and light target loads might be better. If accuracy is lousy, it might do better with .38 S&W ammo, which can be a bit hard to find and is usually pretty expensive these days.