This may be a longshot, but LTV was a steel company in Cleveland, Ohio. They had their own police force and issued revolvers. They used to issue 38/44 Heavy Duties with 5 inch barrels. They sold those off back in the day for 145 bucks. I should have bought a dozen of them! A fellow officer's father retired from that force years ago. The revolver you have may be one of the replacement guns.
The LTV plant physically occupied an area the size of a suburban city. They were, as others, a vital wartime industry. I grew up not very far from there.