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.
CTG stands for Cartridge
The term ".38 Special CTG" is an abbreviated way of saying .38 Special Cartridge. It is the caliber marking for a revolver that fires that cartridge. While it is NOW the most common .38 caliber cartridge, there are more than a dozen DIFFERENT .38 revolver catridges that were made at one time.
Cartridge
What are you asking?
ctg = cartridge
1977.
100-650 USD
1982
Your Colt Trooper .38 special CTG # 68404 was produced around 1968. made 1968. value depends on condition
38 special is a full length 38 cartridge whereas a 38 S&W cartridge is also a 38 caliber but it has a shorter case.
1952
Made in 1979.