Howdy
This is really easy.
S&W changed over from model names to model numbers in 1957. Before 1957 the K-22 was known as the K-22. Afterwards it was known as the Model 17. Open up the crane. If it says MOD 17 inside (Model 17) or MOD 17-3 or anything like that it was made after 1957.
If it doesn't have a Model number on the frame under the crane, but instead has some assembly numbers, it is a K-22 and was made before 1957. So it is more than 50 years old. Period. In addition, S&W revolvers made before 1957 usually have the gun's serial number appear in 4 distinct locations. Bottom of the butt, underside of the barrel, rear of the cylinder and underside of the extractor star. I have never seen a post 1957 Smith that has the SN anyplace other than the bottom of the butt.
But a model number on the frame under the crane is the dead giveaway. No model number and it was made before 1957, and is at least 50 years old. I have bought plenty of old Smiths on my C&R armed with just that information alone. Then again, I usually have a copy of the SCSW handy anyway to look up SNs.
If it is 50 years old, it is C&R. Period. You don't have to look it up on any list. The dealer may or may not honor that information, that is his right. In fact, he can refuse any sale he wants to for any reason he chooses. But if there ain't a model number under the crane, it is over 50 years old (do the math) and it is C&R.
Here is a great site to learn all about C&R.
http://www.cruffler.com/
At the top of this photo is my K-22, that shipped in 1932. I bought it at auction on my C&R, no questions asked. For comparison in the middle is my Model 17-3 that I bought brand, spanky new in 1975. Bought the silly MIM, lock equipped, stainless, 10 shot 617 on a whim a few years ago.
