Similar to 2nd Generation Sheriff's Model. Serial number and the fact this model is also chambered for .44-40, are the only external differences. Colt offered this model with interchangeable cylinders—.45 Colt/.45 ACP or .44-40/.44 Special—available in 3" barrel, blued and case colored finish standard. NOTE: Add 30 percent for interchangeable cylinders; 10 percent for nickel finish; $250 for ivory grips.