The best reference is The Standard Catalog of Smith and Wesson, 3rd ed. by Supica and Nahas
You must call S&W with the serial number to find out.
@ 1969.
@1969.
@1981
1969-1970
No serial number = no way to answer.
No serial number = no way to answer.
Very late 1926
1961-1962
S&Ws does not provide a "manufacture" date. They can give you the date that it shipped. Your question is impossible to answer without the serial number. You will have to call S&W.
Mine has a tag on the left side (on the outside) which tells the manufacture date. Unless someone removed it for some reason. Mine says Date of Manufacture 10/98 along with the serial number and the model number.
@ 1960