The Greubel Forsey Double Balancier 35˚ features two inclined fixed‐oscillators. This unique regulating system comprises two inclined oscillators and escapements. They are driven through a spherical differential, which provides the average of their rates via the gear train to the time display.
A movement with two oscillators inclined in different three dimensional planes offers two notable factors in the pursuit for improved chronometric performance. Firstly the inclined oscillators act in stabilised positions to significantly reduce the possibility to be in either a horizontal or vertical position. The second is that the two inclined fixed oscillators are linked by a spherical differential that averages rating differences and ensures an optimal performance at all times whether in stabilised (horizontal or vertical) positions or dynamically (on the wrist).
The 35˚ inclination of the inclined balances allows for larger diameter balance wheels (better inertia for more stable timekeeping) in a very comfortably‐sized 43.5mm case.
As with all Greubel Forsey timepieces, the level of hand‐finishing and decoration throughout the Double Balancier 35˚ is without compromise. Movement components are designed with forms that bring out their beauty to maximum effect, offering myriad sublime details to be discovered and esteemed. Frosted plates, black flat polished steel and stunning hand‐polished bevels with sharp internal angles (which machines cannot do as well as a highly experienced hand) bring unparalleled vivacity. Large jewels set in polished gold chatons, and mirror‐polished screws provide evidence of the extremely high quality that pervades every aspect of this timepiece.
In order to obtain the average timing rate in a stable position, we explored using the Double Balancier, i.e. two oscillators positioned along two different axes at precise predetermined angles. Thanks to the combined effects of the spherical differential and the angle of the balances, this system helps to minimise the effects of gravity and maximise timing precision in stable positions.
Double Balancier 35˚
Double balancier, hours and minutes, small seconds, power-reserve.
- Case material White gold
- Limitation 6 pieces (2013)
- Chronometric power reserve 72 hours
- Case diameter 43.5 mm
- Water resistance 3 ATM - 30 m - 100 ft
- Number of parts 365
- Frequency 21,600 vibrations/hour
- Height (incl. crystal) 14.34 mm
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