L&R has cylinder with 6 bolt stop notches. Rigdon & Ansley Augusta model have 12 bolt stops like the Manhattan revolvers did - the pair I have were made from a pair of L&Rs that had the 6 extra slots milled in the cylinders.
G&Gs were "as well finished as those made by the Patentee himself" according to an article in the Macon GA Telegraph on August 5 1862. And a subsequent report by Cpt Cuyler who had been placed in charge of CS Ordinance at Savannah includes a paragraph that says "I demonstrated to the foreman the process of case hardening, tmpering springs, and tinning steel without the use of acids and described the manner of bluing."
I would take it from these reference and others that CCH and Blue were the finishes of the day.