Success of Single Six led to production of a larger version chambered for .357 Magnum cartridge. This model is a single-action, with 6-shot fluted cylinder and flattop strap with adjustable "Micro sight". Barrel length 4.625", 6.5" and 10". Finish blue, with checkered hard rubber grips on early examples and smooth walnut on later ones. Approximately 42,600 manufactured between 1955 and 1962.