Greubel Forsey first unveiled the Différentiel d’Égalité at Baselworld 2008 as part of the EWT Laboratory and then presented a more advanced version of a technical demonstrator at SIHH 2010. Since then, further exciting paths have been explored to help optimise accuracy in this timepiece. The Différentiel d’Égalité enables steady distribution of power from the mainspring barrel to the regulating organ, which maintains a constant balance amplitude during the 60 hours of the power reserve.
In a first for Greubel Forsey, this timepiece features dead-beat seconds. This makes it easier to read and to set the time precisely. The timepiece is equipped with a balance wheel stop and seconds reset activated by pulling the crown. The heart and the hammer of this mechanism are visible on the movement side.
The 30˚ angle of the balance wheel and escapement minimises the effects of gravity and ensures efficient movement performance in stable positions. This Greubel Forsey technique guarantees excellent mean/averaged balance wheel performance, which is the mark of heightened timekeeping accuracy. All of these components work together magnificently to help improve performance.
The Différentiel d’Egalité is based on a spherical differential that receives energy from the mainspring barrel and releases it in constant amounts to the regulating organ. In order to maintain this constant rate, the mainspring barrel powers a secondary spring, which is rewound every five seconds. Placed before the regulating organ, the spring ensures a uniform transmission of energy by eliminating power variations from the mainspring barrel and correcting variations in torque generated by the gear train.
Spherical Différentiel d’Égalité, inclined fixed escapement, hours and minutes, dead-beat seconds, small seconds, power-reserve, stop balance and reset on dead-beat seconds.Download the data sheet
- Case material White gold
- Limitation 11 pieces (2018-2021)
- Chronometric power reserve 60 hours
- Case diameter 44 mm
- Water resistance 3 ATM - 30 m - 100 ft
- Number of parts 359
- Frequency 21,600 vibrations/hour
- Height (incl. crystal) 15.30 mm
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