Hamilton - Khaki Action Chrono Big SS/Slv/Blk - Run by quartz movement Hamilton 631323 provides only the highest levels of precision. Standard corrosion issues are dispensed thanks to the leather band that adorns the watch. Guaranteeing durability and robustness the Hamilton 631323's case is engineered from stainless steel. Perspiration and sprinkles will not harm the 631323 thanks to its 50 meters water resistance. Covering the display is a crystal dial window.