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You will need to buy or find a copy of the Standard Catalog of Smith and Wesson.
No data source known.
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.
Find a book with sn lists for S&W. The Standard Catalog of Smith and Wesson, by Supica and Nahas has what you are looking for.
email the serial# to smith & Wesson and they will respond with the date
Call Smith and Wesson with the serial number and the will tell you.
Find a copy of The Standard Catalog of Smith and Wesson by Supica and Nahas.
S&W did not make a firearm with that name.
serial number 28402
Some older models of S&W revolvers you have to remove the grips to find the serial numbers engraved on the grip frame.
62092
You will have to call S&W with the serial number to find out.