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In 1952 Smith & Wesson debuted two J-frame Centennial revolvers the Model 40 and Model 42 named in honor of the company’s 100th year. The Model 42 Centennial Airweight was designed as a lightweight aluminum alloy revolver with a fully concealed hammer. The Model 642LS is a variation on the Model 42 Centennial Airweight that integrates the time-tested features of the original with modern advancements.