The patented annual calendar was launched in 1996 and has been a success story for the past 20 years. Indicating the day of the week, the date and the month, and requiring correction only once a year, this ingenious mechanism has emerged as one of Patek Philippe’s flagship models. It offers a choice of different displays and nuances of style, always combining elegant lines, noble materials and lavish attention to finish. WATCH Self-winding mechanical movement. Caliber 324 S QA LU 24H/303. Annual Calendar. Moon phases and 24-hour display. Sweep seconds hand. DIAL Silvery opaline, gold applied hour markers. CASE White gold. Sapphire crystal case back. Water-resistant to 30 m. Case diameter: 38.5 mm. Height: 11.2 mm. STRAP Shiny black alligator. Fold-over clasp.