Welcome to the Forum. We need a minimum of the caliber of the revolver. It should be stamped on the right side of the barrel. Also, did you find that number on the bottom of the butt-frame? Whatever it is, the stocks indicate the revolver is from the 1920s decade.
It's a Military & Police Model, one of several million produced since the late 1890's. Yours is likely from the late 19-teens or early 1920's (given I have 264678 shipped March 1, 1917, and 354467 shipped November 16, 1920).