Hi all, this is my first post here. I was given an old K22 that belonged to my grandfather. I'm trying to date it and was hoping you guys could help me.

Serial: K 468XX (on bottom of grips)

https://www.dropbox.com/s/1jo9wdfzjz...2018.34.15.jpg

^^^this is a picture of the firearm. Thanks in advance to all the nice people here!