From features, manufactured 1930-36. Probably a .44 Hand Ejector Third Model (Model of 1926) or .38-44 Heavy Duty depending on the round for which it is chambered. Lanyard loop may or may not be original. The front sight has been modified.
Just to make sure it is not a put-together gun, check the numbers stamped on the inside of the ejector rod shroud, the rear face of the cylinder, and the butt. If the number on the butt has been destroyed by the lanyard loop, take off the stocks to see if was transferred to the left side of the grip frame.