Hamilton H40555731 American Classic RailRoad AutoProduct Overview A classical three hand watch with tradition, signature style, and American spirit. From the good old days of railroad clocks to modern wristwatches. It features the H 10 automatic movement with a standard power reserve of 80 hours and a bold dial design reminiscent of steam locomotive wheels. Specifications Product Number H40555731 Caliber H 10 Collection American Classic Movement Automatic Case Size 40mm Thickness (mm) 11. 35 Dial