Impossible to answer without a detailed description of all features, condition, finish, box, papers, accessories, etc..
made about 1968
@ 1970
Early to mid 80s
Impossible to answer without the serial number.
No difference. CTG is the abbreviation for cartridge. A revolver marked 38 Special CTG, or .38 S&W Special CTG is simply indicating that it is chambered for a .38 Special cartridge. This IS different from .38 S&W, and older, shorter, fatter, less powerful cartridge.
1977.
CTG stands for Cartridge
You need to call S&W, the sn you list does not appear in any reference I have.
@ 1973
Made about 1978
Yes, if the serial number is listed.
Impossible to answer without the serial number.