This revolver, also known as Model 117, chambered for .357 Magnum cartridge. Has 2.75", 4", or 6" barrel. Features adjustable sights, with blue or stainless finish and a square butt, with checkered walnut grips. Manufactured between 1970 and 1985. Early guns with fixed sights and square butt were also marked "Security-Six". Later termed "Service-Six" and so marked. Prices listed only for adjustable sight and square butt "Security-Six" models. Note: Fixed sight guns marked "Security-Six" and round butt "Security-Sixes" with adjustable sights worth a premium.