Patek Philippe introduced the reference 5110 to the market in 2000, and eventually discontinued it in 2006 replacing it with the reference 5130. Both are fantastic World Time watches. The watch we have here is 18kt white gold circa 2005. This world time wristwatch features 24 cities on the exterior revolving chapter ring, which can be easily adjust by the pusher positioned at 10 o'clock. This outermost ring contains the names of 24 cities, each of them a reference city for each of the earth's 24 timezones. The original dial is opaline white guilloche with applied hour markers in the center. Revolving around the center is the 24 hour ring, which makes one counter-clockwise rotation every 24 hours. This fantastic watch is powered by a caliber 240 HU automatic movement with micro rotor. This timepiece comes on a black Patek Philippe strap with original 18kt white gold deployment buckle.