Patek Philippe · Automatic

240 HU

The world-time version of the 240, and the reason that complication can sit in a case this thin. Louis Cottier's twin-disc system — 24 cities on one ring, a 24-hour scale on another, both advanced from the crown — adds only 1.35 mm to the base caliber, taking it from 2.53 mm to 3.88 mm. The micro-rotor runs on zirconium ball bearings rather than steel, which matters when a rotor that small has to wind a movement carrying an extra 100-odd parts.