The Patek Philippe reference 5524 is one of the most distinctive contemporary models in the Calatrava collection, introducing the manufacture's historic pilot watch heritage into a modern luxury timepiece. Unveiled in 2015, the Calatrava Pilot Travel Time combines a bold aviation-inspired aesthetic with Patek Philippe's innovative dual time zone complication, powered by the automatic Calibre 324 S C FUS. Its highly legible dial features large luminous Arabic numerals, local and home time displays, a date indication synchronised with local time, and day/night apertures for each time zone, making it an exceptionally practical companion for international travel. Produced in white gold and later rose gold, with a range of dial variations throughout its production, the 5524 has become one of Patek Philippe's most recognisable modern references, celebrated for its distinctive design, technical innovation and successful reinterpretation of the manufacture's rare military and aviation timepieces from the early twentieth century.