1968
Smith&Wesson model 14
74-75
1977
Serial number.
1946-1948.
The worth is $539
MOdel 10 or 12
S&W has not used a G prefix serial number.
Call S&W and the will tell you
You must call S&W to find out.
Call S&W and they will tell you when it left the factory.
You must call S&W to find out.