Can't answer without the serial number.
1979
1974
1980
1980
Try ask.com if you haven't already.
Late 1973 to early 1974.
c.1956
1977-78.
No way to answer without the serial number.
30 yrs or so
58 years old
Call S&W or acquire a copy of the Standard Catalog of Smith and Wesson, 3rd edition