Introduced in 1954 at the urging of Bill Jordan, a competition shooter with U.S. Border Patrol, who went on to become a respected gun writer. Built on "K-Frame" and was first medium-frame revolver chambered for the powerful .357 Magnum cartridge. Since its inception, this model has been one of S&W's most popular revolvers. First revolver to be introduced as a four-screw model. Originally offered with 4-in. heavy barrel with extractor shroud; 6 in. became available in 1963. Finish blued or nickel plated. Grips are checkered walnut. Goncalo Alves target stocks first appeared in 1959. In 1968, a 2.5-in. round butt version was introduced. Became the Model 19.