Well, it's a prewar frame that has been modified to accept a Model 57 barrel and, presumably, cylinder -- though the original cylinder might have been bored out from .38 to .41 caliber.

That serial number is right in the middle of a cluster of .38/44 Heavy Duty revolvers, so that's a reasonable origin guess. But it is at least theoretically possible that this frame was originally on a .455 HE, as there was some serial number overlap between the models.

The top of the frame has been channeled in order to accept a postwar micrometer click sight, and the area in front of the sight has been grooved to match the rib on the later barrel. This was not an adjustable-sight revolver at its time of manufacture.

The stocks are from a third era -- those are 1920s service stocks. Do they have a number stamped or penciled inside them? And do you see the serial number stamped on the back face of the cylinder?

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David Wilson