Got a model 36-1 5 shot 38spl CTG from my dad. What doea the CTG mean and wondering what the age and worth would be on the cylinder arm it has a 4 digit number the serial number is covered up by after market grips . I know the gun to be atleast 30 years old as I am 27 and he bought it used shortly before I was born and he is the third owner .The gun is 100% but has no box or paper work with it . Thanks in advance
Bamaboy