Made from 69-72 ,with some trickling out after that. Great revolvers ,victims of stubborn Colt fans to accept the new action. Colt should have used lighter springs, offered a 2 and 3 inch round butt version ,as well as stainless ,and a 22 version. But they didn't. Too bad ,but your gain. I have 2 and really like them. With semiautos being hi cap limited in many places ,new shooters, especially women , buying home defense guns , the revolver is making a comeback. A revolver like the OP Mark 3 , bull strong ,and loaded with 158 lhp, is about the the perfect choice. The Mark 3 Official Police is about the same weight as a S&W K frame , but much stronger.