Look closely- Ill bet you it says C T G. That is the abbreviation for cartridge. As in the marking on the barrel- says something like 38 S&W CTG? Means that it is chambered for the .38 S&W cartridge (which is NOT a .38 Special)
Impossible to answer without a sn.
1500
Call S&W and they will tell you when it left the factory
Enhanced
Double Action
Enhanced
'ctg' cartridge
Cartridge
Cartridge
I believe it alludes to production periods
A shotgun made for Smith and Wesson, sold under the Smith and Wesson name.
No such S&W trade mark