Dating back to the 1930s, World Time watches are more relevant in today's global market than ever before. Allowing the tracking of all 24 time zones, the Patek Philippe World Time Ref. 5131 watch takes inspiration from those early timepieces. Fitted with a mechanical calibre 240 HU self-winding movement with a 48-hour power reserve, this elegant watch features hour and minute hands in the centre that display the local time. Surrounding this are two discs, one mapping the 24 time zones by world city, the second a 24-hour scale of day/night hours. The central dial displays a miniature map of The World, crafted in cloisonée enamel, over which an evocative globe-shaped hour hand passes with the minute hand. Turn the Patek Philippe World Time Ref. 5131 over and the beautifully crafted mechanical movement is visible through the sapphire crystal case back, revealing a 22ct gold off-centre rotor and eight bridges. With all its intricacies, the 39.5mm yellow gold case ensures excellent legibility and its slim frame is remarkably simple to use: a single push piece at 10 o'clock switches effortlessly between time zones.