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World time is a model equipped with a complicated mechanism "world time mechanism" provided by Patek Philippe.
As a feature, the names of countries around the world are engraved on the outer circumference of the dial,
It is a mechanism that allows you to instantly know each time.
Unlike the GMT function, there is no need to check the time difference, so it is useful for people who fly around the world.
It is said that the first appearance was in 1937, and at that time it was a reference called Ref.515 HU.
It was deployed in a rectangular case.
After that, a round type with the name of each country on the bezel was developed,
A form close to the current world time has been completed from the development of Ref.5110 that appeared in 2000.
Ref.5930, the latest model, has succeeded in installing a chronograph,
World time, which has stepped into a more complicated mechanism,
It can be said that it stands out among the complications.