The S&W 32 Safety Hammerless 3rd model was shipped from 1909 to 1937 with serial numbers 170001 to 242981. It would be hard to guess exactly when it was shipped as the break top revolvers were losing popularity in the 1920s and 1930s. I would guess that yours was from the 1920s. Blued units were less common than nickel plated. A nice revolver to have and even shoot. It takes 32 Smith & Wesson Cartridges.