The Patek Philippe Nautilus Annual Calendar Steel White Dial 40mm Ref. 5726/1A-010 seamlessly integrates a complex annual calendar within the iconic Nautilus design. Housed in a 40mm stainless steel case, the watch features a clean white dial with luminescent index markers and a moonphase display, offering both functionality and modern appeal. The annual calendar complication automatically adjusts for months with 30 and 31 days, requiring manual correction only once a year in February. Additional features include a day, date, and month display, as well as a 24-hour indicator. Powered by the self-winding Calibre 324 S QA LU 24H/303, it delivers a 45-hour power reserve, ensuring reliable performance. The watch is paired with a polished stainless steel bracelet and deployment clasp, complementing its rugged yet refined aesthetic. Protected by a sapphire crystal and offering 100 meters of water resistance, this timepiece is as versatile as it is sophisticated.