K130218 was produced in 1951
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.
You must call S&W. The number you list does not follow normal conventions.
1953
1954
1972
racrolelt
1948
@1947
Look on the butt of the revolver.
i think 1966
Standard Catalog of Smith and Wesson, 3rd, ed.