Breguet's Classique Hora Mundi 5717 is the first example of a mechanical timepiece with an instant-jump time-zone display. This function allows the traveller to easily display the time in two pre-selected time zones, changing instantly from one to the other simply by pressing a button, without disturbing the operation of the watch. Accurate operation during setting is ensured by a stop second system. Changing the time zone affects not only the time, but also the date synchronised through a "tracking” calendar system – and the day/night indicator. This unique timepiece is made of precious materials: 18-carat red gold or 950 platinum. Three versions of the dial are available, each representing one part of the world: the Americas, the European and African continents, or Asia and Oceania.

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