My blued Colt SAA .45 with 7 1/2" barrel made in 1959. Finest gun I have ever shot and handled. It's the last year they made the fixed firing pin; however, this one has the round top hammer Colt started making for the fast draw era. They only made this hammer about a year or so. My dad bought the gun new on 12/12/59; I was born on 12/12/65. It was the first gun I ever shot (when I was 3), and it's the last one I'll go to my grave with.