racrolelt
1954
@1947
1972
If you call S&W, they will tell you.
1948
Look on the butt of the revolver.
i think 1966
Your Smith and Wesson K-22 was made in the year 1948,with the serial number K20708.That year the serial numbers were K18732-K73121.I hope that you find this informative.
1953
Minty K22's can bring $500, or more in rare variations. I don't think that is the serial number however. The serial number will be found on the butt of the gun, not inside the crane.
K130218 was produced in 1951
You must call S&W. The number you list does not follow normal conventions.