Hello George
The Guns serial number will be on the bottom of the grip frame. If it is a K-22 it will have a K-Prefix before the serial number as all Post-War K-22's had this K-Prefix and with yours having the Four Line address stamped on it's frame as you indicated, it will certainly be a Post-War Model. Given the serial number has a K-Prefix in front of it, according to my information, and with the Partial serial number you provided yours dates 1954-K-210096--K--231255. I hope this helps, Thegeneral.
