PATEK PHILIPPE COMPLICATIONS WORLD TIME 39.5MM PLATINUM MEN'S WATCH
This incarnation of the 18K white gold Patek Philippe 5130P-001 Complications World Time watch has a larger case of 39.5mm and was introduced in 2006. It replaced the 5110 that debuted in 2000 for the millennium, which was 37mm.
It is inspired by the original World Time watches with a newly hypnotic blue guilloche sunburst pattern in the center, and more surface area with which to read the 24 time zones. The functions are hours, minutes, small seconds, and world time.
The Patek World Time system is based on Master horologist, Louis Cottier's 1930's mechanism for exhibiting time zones all over the world.
The ring-shaped hour hand also comes from the designs of the 1930's and 40's; the button at the 10 o'clock position adjusts the 24-city complication by advancing the hour hand in hour increments to get the local time while you're traveling. This moves the city ring so your local time zone will appear at 12 o'clock; the ring is color coded to indicate if it's day or night.
Dial : Blue
Diameter : 39.5mm