Impossible to answer without a detailed description of all markings and features.
You will need to add the model of Smith and Wesson to your serial number to get the correct year of manufacture.
No such model number.
Your Smith and Wesson model 19 was made in the year 1978 by the serial number that you have supplied.
Your serial number was used by Smith and Wesson for the models 10,12,13,45,64,65,547.It dates this serial number to the year 1979.
smith and Wesson has a collectors site, Google it.
No such model number.
No serail number = no answer.
No such model number.
I cannot assign a year of manufacture without you providing a serial number to your Smith and Wesson model 28.
Contact Smith & Wesson customer service through their website.
Your serial number indicates that your Smith and Wesson model 59 was made in the year 1975.
Your serial number indicates that your Smith and Wesson model 18 was made in the year 1962.