Experience precision and style with the Patek Philippe Annual Calendar Chronograph Steel Green Dial 42mm ref. 5905/1A-001. This remarkable timepiece showcases a self-winding mechanical movement powered by the Caliber CH 28-520 QA 24H. The striking olive green sunburst dial features gold applied hour markers, complementing its sporty design. The 42mm stainless steel case is both robust and sophisticated, offering water resistance up to 30 meters and a sapphire crystal case back that reveals the intricate movement within. The integrated bracelet, crafted from stainless steel, features a blend of polished and satin finishes for a modern touch. Unique to this model, the patented Annual Calendar adjusts automatically for 30- and 31-day months, needing just one adjustment each year on March 1st. With its flyback chronograph functionality and a 55-hour power reserve, this watch seamlessly combines utility and elegance, making it an essential addition to any collection.