The first version features a light yet robust carbon case, crown and buckle head. Highlighting the unique technical and aesthetic prowess of the piece, the DEFY Fusee Tourbillon is produced in two different editions. The greater turning movement provided by the fusee compensates the weakening mainspring pull, thus maintaining the torque and, consequently, the amplitude of the regulating organ constant throughout the duration of the mainspring’s autonomy.īy combining the fusee and chain mechanism with a tourbillon regulating organ, Zenith places precision at the forefront of its unique take on Haute Horlogerie. As the mainspring unwinds, more of the chain wraps around the barrel, detaching itself from the wide conical base of the fusee. Known as the “fusee and chain” a miniature chain is coiled around a conical “fusee” and attached to the mainspring barrel. Positioned at the edge of the dial between 4 and 5 o’clock, a red-tipped hand indicates the power reserve, a handy feature when manually winding the DEFY Fusee Tourbillon with its 50-hour power reserve.Īs a mechanical movement’s mainspring unwinds, the torque it delivers to the regulating organ drops, resulting in less efficient chronometric performance of the movement.Ī centuries-old solution to counter this and achieve constant force lies within the power source and its transmission. Like the chain, the tourbillon cage is embellished with a striking blue color, reinforcing the visual effect of the DEFY Fusee Tourbillon’s unique moving parts. On the opposite end at 6 o’clock, a tourbillon cage with a new construction featuring an off-centered balance wheel makes a full rotation every 60 seconds. The chain, which consists of 575 individually hand-assembled components, features a bold blued treatment: a first for a wristwatch fusee and chain system. On the top half of the movement, there’s the fusee and chain constant force mechanism. The layout of the bridges offers a balanced layout of the various functions and complications.
The spoke design of the bridges is amplified by their bicolor finish, where the top satin-finished surface is given a black treatment, while its polished sides are a lighter grey rhodium tone. It’s immediately clear that the DEFY Fusee Tourbillon’s caliber is out of the ordinary.
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