Impossible to answer without a detailed description of all features and markings. You will have to call S&W.
Call Smith and Wesson with the serial number and the will tell you.
Your serial number indicates that your Smith and Wesson model 18 was made in the year 1962.
smith and Wesson has a collectors site, Google it.
Your serial number indicates that your Smith and Wesson model 39-2 was made in the year 1976.
With the serial number that you have provided,your Smith and Wesson model 39-2 was made in 1976-1977.
You will need to add the model of Smith and Wesson to your serial number to get the correct year of manufacture.
Your serial number indicates that your Smith and Wesson model 29 was made between 1977-1978.
No such model number.
@1957
No such model number.
With the serial number that you have supplied,your Smith and Wesson model 15 was made in the year 1950.
Your serial number indicates that your Smith and Wesson 38 special was made in the Year 1960.