I have not been on here in a while. I missed looking at all the history. Recently I was given a K-22 5 screw single line with serial # k957xx. My grandmother bought two sometime around the early 50's. One went to my great grand father the other to her husband. Mine has seen some usage the other is 95% or better. Not sure of it's serial #. I was wondering if you guys could help me date it. She just passed and was not sure of the details. Thanks for all who ask here with a little family history. I will post pictures as soon as possible.