PATEK PHILIPPE | REFERENCE 5131 A WHITE GOLD WORLD TIME WRISTWATCH WITH CLOISONNÉ ENAMEL DIAL IN SINGLE FACTORY SEAL, CIRCA 2009 " | 百達翡麗 | World Time 型號5131 白金世界時間腕錶，備掐絲琺瑯錶盤，原廠未開封，機芯編號3925208，錶殼編號4490959，約2009年製"

Patek Philippe launched the reference 5131 in 2008. First introduced in yellow gold, the white gold version, as the present example, was also unveiled at Baselworld the following year. Today discontinued, the 5131G is considered both as an horological marvel as well as a work of art with its hand painted cloisonné enamel dial depicting four continents, Europe, Asia, Africa and Oceania. 

As the perpetual calendar chronograph pieces, the World Time watches are iconic models from Patek Philippe. The manufacture has kept the essence of the early references such as the 1415 which was first introduced in 1939 and engineered by Louis Cottier. Coincidentally, the first 1415 with an enamel dial, also depicting a map, was made exactly 60 years before the 5131 was introduced.