The Patek Philippe Calatrava Pilot Travel Time Alarm Platinum Black Dial 42mm Ref. 5520P-001 is a highly functional timepiece designed for modern travelers seeking precision and practicality. Encased in 42mm of polished platinum, this watch features a black lacquered dial with bold luminescent Arabic numerals and hands, ensuring optimal legibility. Dual time zone functionality is made possible by an additional 12-hour hand and day/night indicators for both local and home time, making it ideal for frequent travelers. Powered by the self-winding Calibre 324 S C FUS, the watch also includes an innovative 24-hour mechanical alarm, controlled by a platinum pusher system integrated on the case. The sapphire crystal case back reveals meticulous finishing of the 29-jewel movement with a 45-hour power reserve. Paired with a black calfskin leather strap and platinum clasp, the Ref. 5520P-001 combines robust technical performance with the craftsmanship expected from Patek Philippe.