Never heard of "ctgf", but "ctg" means cartridge.
On an airweight Smith & Wesson firearm, or any firearm, "ctg" means cartridge. For example, "38 special ctg" or "38 spl ctg" would mean the firearm fires a 38 special cartridge. Cartridge in reference to firearms means the entire package which carries the projectile or bullet, the powder or propellant charge, and the primer which detonates and ignites the powder. The cartridge case is usually made of brass, or less commonly, steel. Many antique cartridge cases were made of copper. What many people incorrectly call the "bullet" is actually the entire cartridge package.
CTG = Cartridge
Not enough information to answer. If you will post ALL markings, and a description of the firearm, we'll try to give you an answer. S&W Ctg is a partial caliber, not a make of firearm. Several companies made firearms for cartridges named by the S&W company.
Cartridges
Cartridge
ctg is short for 'cartridge' as in 357 cartridge.
ctg = cartridge
Serial number.
By the serial number.
Would need to know which model, and the condition of the firearm. sales@countrygunsmith.net
The exact value of a used Smith and Wesson Airweight 38 SPL CTG is actually dependent upon a number of factors. Some of these things would be, exactly how used it is and the age of the firearm.