Double Balancier 35°

Greubel Forsey 2013

Double Balancier 35°

Continuing their fundamental research into precision timekeeping, Robert Greubel and Stephen Forsey unveil a timepiece whose movement integrates two inclined balances which are coupled by a spherical differential. Accounting for 28 of the 365 parts in the movement, this spherical differential averages the difference in rate of the two escapements and delivers this to the gear train. Limited edition of 6.

Movement | hand-wound mechanical Manufacture calibre, 21,600 vibrations/hour frequency for each balance, 72-hour power reserve

Functions | hours, minutes, seconds, power-reserve indicator

Case | white gold, 43.5 mm ø, 20.3 mm high