Nice wheelgun! Looks like mine, a 1968 Model 12-2, which is the same except its the airweight version and has a square butt. It was given to me by family, and it served as my first carry gun.
The one biggest improvement I made on it was adding a "T-grip". I always hated the way my fingers slid up behind the trigger, with my trigger finger angled downward to get around the trigger. A t-grip made the grip much, much nicer, with no modifications necessary to the gun. Particularly with K-frames like these, it seems to help, and I have better trigger control. I'm partial to the straight "inline" feel of an automatic, so the t-grip improved my ability to handle the gun considerably.
(sorry for the plug...I'm in no way related to the guys that make these, just a satisfied customer!)