The Hamilton Khaki Aviation Converter Auto H76615530 is a 42mm automatic watch featuring a sleek black dial and a bi-directional rotating slide-rule bezel for performing critical calculations and conversions. It is powered by the H-10 automatic movement, offering an 80-hour power reserve and enhanced precision with its Nivachron™ balance spring. The stainless steel case is complemented by a cow leather strap with a pin buckle. Additional features include a sapphire crystal with anti-reflective coating, an open case back, and water resistance up to 100 meters. Reference number: H76615530.