Serial number ? ? ?
Your gun can not be a -3! These were introduced in 1983 and would have had an "N" serial prefix. The -1 change was introduced in Nov 1960 @ approx. S220xxx, However, my data base shows -1 guns in the S217xxx, S218xxx, and S219xxx serial number range and none of them left the factory before mid 1962. Is everyone confused yet? The confusion comes from us collectors trying to put our guns in numerical order by serial number along with all the engineering changes! S&W IGNORED the serial number when manufacturing, assembling, storing, and shipping these collectors pieces! A factory letter MIGHT give you the answer you are looking for!
jcelect