Patek Philippe invented the world time complication in a wristwatch and today, after innumerable imitators, Patek Philippe still makes the nicest worldtimer. It's no surprise - that's Patek in a nutshell.
Case is 18k rose gold with diameter of 40mm and thickness of 10.4mm. Sapphire crystals front and display back. Button at 10 o'clock advances the hour hand in one hour increments. This allows the traveler the ability to change the time as he or she travels through time zones.
Dial is silver. Inner zone is guilloche with hour markers. Surrounding this area is a ring with numerals '1' through '24' which represent the 24 hours in a day. This ring turns counter clockwise, making a full rotation once every 24 hours. The time in the 24 reference cities, printed in the dial's outermost area, can be seen simultaneously with this world time system. In my opinion, this manner of tracking world time is much better than watches which merely use a 24 hour "GMT" hand, forcing the wearer to calculate world time versus simply reading it at a glance as this watch allows.
Movement is the Patek Philippe Caliber 240 HU with 33 jewels and 48 hour power reserve.
Strap is Patek hand sewn crocodile with 18k rose gold Patek deployment clasp.
Watch is new with box and papers dated December 2014.