In bringing the Quadruple Tourbillon and the GMT mechanisms together, Greubel Forsey not only accomplished a major technical feat that led to the creation of a new hand-wound calibre comprising 805 parts, including three fast-rotating barrels. The Inventor Watchmakers also tackled this challenge from an architectural angle to create a timepiece in which the three-dimensional approach is expressed on many levels.
The main hours/minutes dial between 1 and 2 o’clock forms the highest point of the dial, where it is underlined by the subtle asymmetry of the case and complemented by a 72-hour chronometric power-reserve display. The next level is it at 4 o’clock, with the coaxial small seconds and second time zone display which is adjustable in one-hour increments by means of a pusher. Located between 8 and 9 o’clock, observers can admire the spectacular sight of the Earth in motion, surrounded by a fixed 24 hours ring around the Equator and displaying local time for all the longitudes – simultaneously taking account of the day/night indicator (on respectively light/dark zones).
Universal time is visible through the case back, with a fixed 24-hour scale bearing day/night zones and a disk with three-letter abbreviations of 24 cities representing the various time zones. This disk also distinguishes between the time zones that implement Summer Time (Daylight Saving Time) appearing in a light colour; and those that do not (shown on a dark backdrop). The case back also provides a chance to admire the Quadruple Tourbillon as well as frosted bridges with jewels set in gold chatons. The two complex asymmetrical convex sapphire crystals protecting the dial and case back also called for the utmost expertise.
Each of the four tourbillons connected to a spherical differential contributes independently to obtain a precise and reliable timing rate especially in stable positions. The spherical differential transmits the average timing rate of the four tourbillons, thus improving the chronometric performance of all the regulating organs.
GMT Quadruple Tourbillon
GMT, 2nd time zone, rotating globe with universal time and day-and-night, universal time on 24 time zones, cities observing summer time, lateral window showing the equator and southern hemisphere, GMT pusher, Quadruple Tourbillon, hours and minutes, small seconds, power-reserve.Download the data sheet
- Case material White gold | Titanium
- Limitation 18 pieces (2019-2022)
- Chronometric power reserve 72 hours
- Case diameter 46.5 mm
- Water resistance 3 ATM - 30 m - 100 ft
- Number of parts 705
- Frequency 21,600 vibrations/hour
- Height (incl. crystal) 17.45 mm
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