Audemars Piguet Royal Oak Perpetual Calendar 26574ST: The Audemars Piguet 26574ST is a symbol of horological excellence. This Royal Oak model boasts a stainless steel case and bracelet, showcasing a captivating blue dial. Its perpetual calendar complication accurately tracks time, day, date, month, and moon phases. A blend of sporty elegance and technical prowess, it's a watch for those who appreciate both style and functionality.