What type of gun? Rifle, shotgun, type of action? Need more info to identify model.
No serial number given.
With the serial number that you have supplied,your Smith and Wesson model 66-1 was made in the year 1981.
No way to know.
The Smith and Wesson model 66-1 was made from 1977-1981.
1983
80s
@1987
The Model 66 was introduced in 1972, the 66-1 was introduced in 1977, the 66-2 was introduced in 1982.
1976
serial number 514X9
1980
Late 80s