Tuesday, February 2, 2010

GREUBEL FORSEY - Invention Piece 3

To pay homage to their third invention, the Tourbillon 24 Secondes Incliné, Robert Greubel and Stephen Forsey have taken on the challenge of housing a watch mechanism, combining complex and innovative techniques within an unprecedented architectural setting.

The third invention consists of a single tourbillon cage inclined at a 25° angle and performing a rapid rotation in 24 seconds. This utterly original mechanism guarantees the watch maximum efficiency and optimal performance on the wrist. Invention Piece 3 features a totally unconventional display with the plates themselves serving as the base for the timekeeping indicators. The four gold plates are engraved with a portion of a personal message from Robert Greubel and Stephen Forsey providing an insight into the complex process involved in creating the extraordinary mechanism of this third invention.


Mechanical hand-wound movement, Calibre GF 01n
Tourbillon 24 Secondes Incliné, hours and minutes display,
Seconds display and power-reserve indicator.
Unique series of 33 pieces
Movement dimensions  
• Diameter : 36.40 mm
• Thickness : 11.51 mm

Number of parts  
• Complete movement : 370 parts
• Tourbillon cage: 87 parts
• Weight of the cage : 0.39 g

Number of jewels  
• 42
• Olive-domed jewels in gold chatons

Power reserve  
72 hours

Rapid rotating twin barrels (1 turn in 3.2 hours) equipped with a slipping spring to avoid excessive tension

Balance wheel  
Variable-inertia with gold mean-time screws (10 mm diameter)

21,600 vibrations/hour

Balance spring  
• Phillips terminal curve
• Geneva-style stud

Main Plates    Nickel silver

Sources from World Tempus