Need bigger pics, T! Looks like a pre-Python .357 or pre-Trooper. If it's a J frame the only option is Pachmayr Presentation grips.
h ttp://www.coltrevolvers.net/
Not entirely correct friend. It is certainly is a "pre-python" but any grips that will fit the 357 Python will fit the original Colt Model 357
(circa 1953-61). They are built on the same Colt 41 frame, known as the I or E frame. The J frame was introduced later on with the Mk III, which had a shrouded ejector rod, much like some S&W sixguns. This one appears to have an unshrouded ejector rod.
Looks like the same one I have with a six-inch barrel instead, IF the picture accurately portraits riker's Colt revolver. It should be stamped/engraved on the left hand side of the barrel plainly:
"Colt Model 357" and this is how it is properly refered to. (OR this could be a "Trooper" in 357 as well, 1961-69, the earlier Trooper)
Do not confuse this as merely for the calibre, this is a constant source of confusion on those that are not very precise in thier description.
There are two other ways to tell if this is a Colt Model 357, other than the barrel marking. One is a two-tone blueing, subdued on the front of the frame and the fluting cutouts on the cylinder, deep & very shiny on almost all other parts. Number two, this was the first Colt with a frame mounted firing pin, and the hammer should be flat with no firing pin on it, unlike earlier models. Yes there were slightly cheaper made Troopers in 357 with the frame mounted firing pin too, but they dispensed with the two tone blueing, and were completely shiny, like a blued Python for instance.
BTW, congrats, these are very very nice shooters. (glass rod breaking trigger is the same as any Python friend, for alot less cash!)
Edit: If I were you, I would use 357 sparingly with this fine piece, and treat it carefully. There are very few knowledgeable Colt gunsmiths around, compared to S&W certified 'smiths. Also L frame S&W speedloaders (S&W 586/686) may work for you as well.
Again, a nice handgun riker!