The S&W pre-model number .357 Magnum revolver, produced from 1935 to 1957 before the model numbering system was adopted. These original Registered Magnums are among the most historically significant and collectible American revolvers. Type: Revolver Action: DA/SA Caliber: .357 Mag Capacity: 6 Year introduced: 1935, USA Weight: 48 oz Overall length: 14.25" Status: Discontinued Intended use: Collector, Historical