Case material: Platinum; Charge: Automatic; Conditions: Never worn Presentation condition : With boxes and all papers; Model: Classique Price on request Gmtbroker Reference: 5717PT/EU/9ZU 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 ha