Old Colt Revolver

I stopped by the LGS for some Unique and LPP's and an old Official Police 38 Spl. was in the case. It was a consignment gun priced at 395. The action was was pretty smooth and the cylinder locked up tight. The blueing is worn in the places one would expect, the muzzle and the front of the cylinder, but it doesn't have any dings at all. I am almost certain the grips are not original but not a big deal, if it's a shooter. Anyway, I bought it, for that price I didn't think I would be hurt that bad and I have been looking for a 4" revolver. Trouble is I know doodly squat about Colt revolvers. Can you guys give me anything on this piece? How about the grips?

Old Colt Revolver