The Patek Philippe Annual Calendar Chronograph (ref. 5905P-010) is a sophisticated, unisex timepiece featuring a 42mm platinum case and a sleek black dial. Powered by the automatic caliber CH 28-520 QA 24H, it offers a 55-hour power reserve and combines annual calendar and chronograph functions. This elegant watch showcases Patek Philippe's renowned craftsmanship and intricate complications. It features a sapphire crystal and 3 ATM water resistance. It is complemented by a black crocodile skin strap with a platinum buckle.