Rafter-S, yes, with adjustable sights the gun is a target model, which excludes the Pre-22.

Another thing that might be useful to know is the gun's serial number. A postwar N-frame serial number should begin with the letter S and have either a five or six-digit number between about S80000 and S160000.

I'm not quite sure what you mean when you say the "old style" small checkered grips. If you mean the magna stocks that come up over the sideplate and frame but are smaller than target stocks, that would be correct for the gun. But if you mean the prewar service stocks that were shorter and had a half-round top that fitted exactly to the frame profile, those would be incorrect for any gun that was called a "Model of 1950."

Sounds like an intriguing gun, and as Semperfi71 said, it could be uncommon and quite valuable. But we can't know until we get a little more information (and best of all, pictures, if that is possible).

__________________
David Wilson