I purchased a k22 today... because I'm a sucker for a smith and an even bigger sucker for anything .22... I'd like to know around when it shipped, serial number is k122xx. More pictures coming later.
The grips that are on it now look like magna PC's. That's from their rounded bottom. PC's often went on 2" guns or those that were to be carried under clothing. Take 'em off and save when you find a proper set of square bottom diamond screw hole grips. Those aren't especially cheap.
The upward bend of the hammer spur is correct for the build era of your K22.
From the picture, looks like its been well cared for and shot a little. Take it to the range!