There have been thousands of Smith & Wesson pistols produced and the date depends on the model of the gun and then the serial number. Have a gunsmith or collector do an appraisal of the firearm and they will tell you the age.
No serial number = no answer.
Smith and Wesson is the make.
No serial number provided.
Not a valid S&W serial number.
1977
@1987.
1916
@1983
No serial number given.
Serial number.
Made @ 1981.
Look on the butt of the revolver.