No sn = no way to answer.
@1964
1977
@ 1980
What serial?
I cannot assign a year of manufacture without you providing a serial number to your Smith and Wesson model 28.
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 model 18 was made in the year 1962.
Your serial number indicates that your Smith and Wesson model 59 was made in the year 1975.
Smith&Wesson model 14
The Smith and Wesson model 19-5 was made from 1982-1985.
Your Smith and Wesson model K-38 with the serial number K180570,indicates that it was made in the year 1953.The serial number range for that year was K-175638 thru K-210095.
The Smith and Wesson model K14-3 was produced from 1947-1982. You would need to write into Smith and Wesson with the model and serial number. They can pull the date and send it back to you.