Classique Hora Mundi in 950 Platinum with a Self-winding movement.
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 – six references in all.
This watch’s most iconic complication, however, is its instant-jump time-zone display system with synchronized date, day/night and city indications, a world first for a mechanical watch.
This function allows the traveler 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.
Changing the time zone affects not only the time, but also the date synchronized through a “tracking” calendar system and the day/night indicator.
it is the first example of a mechanical timepiece with an instant-jump time zone display.
All of the displays jump between time zones with the push of a button.
The concept is so intuitive, one has to wonder why it has not been done before.
The Hora Mundi’s four patent applications claim 1) a timepiece comprising a mechanism with two time zones, 2) the display of a time zone on demand via the main set of hands, 3) a programmable and reprogrammable mechanical memory wheel for a timepiece, and 4) a mechanism for displaying a temporal dimension by means of a dragging hand.
The sun and moon are made of solid gold: yellow gold for the sun, rhodium-plated yellow gold for the moon.
The cover for this disc, representing a cloud and bearing the Breguet name and the watch’s serial number, is also made of silvered 18K gold and engraved entirely by hand.
City indication at 6 o’clock.
Date aperture at 12 o’clock.
Open-tipped Breguet hands in blued steel.

Also known as: Breguet 5717PT/AS/9ZU, 5717PTAS9ZU, 5717PT-AS-9ZU