Welcome to the Forum.
The front sight is wrong for a Combat Masterpiece, they have a ramp front sight, that is a target sight. If you open the cylinder, inside the crane, where the joint is where it swings out there might be a number. It would say Mod- and then possibly a 17 or 18. Look there and tell us what it says. If it is older than 1957 it won't have that. It would then be what we call a "Pre" model revolver. You just say it has a K in the serial number, which is on the bottom of the butt. Give us more of the number. You can xx out the last few to keep it private, but then we can tell you how old it is.
It's really nice to know the family history of the revolver. I hope for your sake you don't need to sell it, but if you do you should get a fair price on here.
Oh, one more thing, don't be afraid to shoot it. That's what it was made for, and K-22s are a lot of fun.
Jim