Hamilton H64645131 Khaki Aviation Day Date AutoProduct Highlights A vintage design paying homage to the pioneering pilots of the early 20th century. This pilot watch combines modern materials such as stainless steel and sapphire crystal, along with an automatic movement and a 42mm modern sized case, embodying both history and evolution. Model Number H64645131 Caliber H 40 Collection Khaki Aviation Movement Automatic Functions Date display, Day display Case Size 42mm Dial Color Black Case Material