A super 14 barrel is 14" long full bull (.81"). The hunter barrel is 14" long but has T/C's muzzle break on it.
Helobill gave you links to production dates.
T/C changed the trigger to easy open around 195000. There was an earlier change in the trigger group but I'm not sure when.
In the '80's, T/C produced AA or chrome plated frames and barrels. They will not fit blued/stainless unless the hinge pin hole is enlarged. The frame serial numbers begin with 'A'. T/C came out with stainless frames in '93.