Between 1994-98
Your Smith and Wesson model 19 was made in the year 1978 by the serial number that you have supplied.
With the serial number that you have supplied,your Smith and Wesson model 66-1 was made in the year 1981.
1960
1974
1962-1969
1980
This gun was manufactured in 1991, according to Smith and Wesson headquarters.
1969
1982
1974
@1972
75-76