Sir.
Very nice very early K22. You have some good examples of the early post war K22's.
I have never seen a good estimate of the serial number range is which 1 line address was replaced by 4 line address.
I have K 25068 1 line, and K 30168 4 line. That is about 5100 serial number window.
Does your 1 line gun fit in that window?
Thank you.
Bill@Yuma