I recently acquired a K22, 6 inch, serial number K212480. It has been rechambered in .22 Magnum. "Mag" is marked inside the crane, but not on the barrel. It says only K22 on the barrel, not Model 17. I'm guessing it is a pre-17 from around 1954-55? It has 3 screws on the sideplate, one at the front of the trigger guard. It does not appear to have a ribbed barrel, but not sure I would know what one looks like.

If anyone could date this for me, or offer any input, I would appreciate it.

Thanks,

SK