Smith & Wesson Centennial Smith & Wesson Centennial S&W Centennial is a family of revolvers made by Smith & Wesson on the "J-Frame". Depending upon caliber, the cylinder holds either 5 (9mm, .38 spl, .357 magnum), 6 (.32 magnum), 7 (.22 magnum), or 8 (.22 LR), cartridges. Centennials feature a fully enclosed (internal) hammer, which makes them Double Action Only (DAO) firearms. Like all other "J-frame" Smith & Wesson revolvers, they have a swing-out cylinder. Centennial models have been made in different versions like PD "Personal Defense", LS "Lady Smith", and M&P "Military & Police" The original Centennial Model 40 was introduced in 1952,
Smith & Wesson returned to his native Springfield, Massachusetts, while Wesson stayed on as plant manager with Volcanic Repeating Arms. As Samuel Colt's patent on the revolver was set to expire in 1856, Wesson began developing a prototype for a cartridge revolver. His research pointed out that a former Colt employee named Rollin White held the patent for a "Bored-through" cylinder, a component he would need for his invention. Wesson reconnected with Smith and the two partners approached White to manufacture a newly designed revolver-and-cartridge combination. Rather than make White a partner in their company, Smith and Wesson paid him a royalty of