If you imagine the 317/3" in stainless steel, you've got the model 63.

I had a 317, sold it, and bought the 63--some more mass to steady the aim, and stainless steel which is easier to maintain. You'll have to use nylon brushes to clean the cylinder of the 317, and the clearcoat is prone to flake.

Still, the 317 is a nice (yes expensive--but aren't all Smiths?) revolver for those looking for a really lightweight kit gun.