Double Tourbillon 30°
With its highly original and innovative interpretation of Greubel Forsey’s first invention, the Double Tourbillon 30° Technique provides the ideal architecture for following a lesson in micro-mechanics. The creators are not simply displaying their expertise with this timepiece, they are sharing it. Through the sapphire crystal, the hour indicator, also in sapphire, open-worked movement and skeletonised hands all contribute to the high visibility of the movement. The Double Tourbillon 30° mechanism provides an aerial ballet with one tourbillon cage rotating in 60-seconds at an angle of 30° turning inside an outer cage with an orbit of four minutes. Four coaxial main- spring barrels, power reserve indicator, small seconds and visual access into the gear train complete the spectacle.
The Double Tourbillon 30° Technique is now offered in a platinum case. The diameter of the case is 47.5 mm and its height is 16.84 mm. Screwed to the caseband at 3 o’clock and 9 o’clock are two engraved plates bearing a message from the Inventors expressing the beliefs underpinning their research in a few key words. At the heart of the movement are the two tourbillon cages comprising 130 components and weighing no more than 1.22 g. A power reserve of 120 hours is provided by four-coaxial mainspring barrels.