Since there are no military markings, it could also be a U.S. Maritime Commission pistol. I have one that was shipped in 1942 to the USMC and it has no military markings.

The interesting thing to me about the one I have is the forcing cone was not cut straight at the factory, the gap between the cylinder and the forcing cone is fine on the right side, and a lot bigger gap on the left. It shoots fine, but theres a noticeable flame out the left side and it’s louder than other 38 Special revolver I’ve shot.

It amazes me how it was able to leave the factory like this, or not get returned so the issue could be fixed. But, in 1942, small arms were being spit out as fast as possible.