Cartier Rotonde de Cartier Astrotourbillon Skeleton watch lays bare the workings of its unusual rotating tourbillon mechanism, suspending it in in the skeletonized movement.The key feature of the Astrotourbillon line is its take on the conventional tourbillon mechanism. A normal tourbillon rotates on its own axis, with the carriage usually making a full rotation every 60 seconds.
The Astrotourbillon uses an elongated carriage to make the mechanism that holds the balance wheel rotate around the perimeter of the dial once per minute. As a result, the tourbillon functions as a center-mounted seconds hand. While previous versions of the Astrotourbillon have used the signature rotating tourbillon design, the tourbillon mechanism typically has been placed between two levels of the dial, thus limiting the wearer’s view. The new skeletonized version makes all aspects of the movement readily visible.
The 38-mm movement, Caliber 9461 MC, is held in place by the Roman numerals at 12 and 6 o’clock; along with the winding stem, these are the only parts of the movement that attach to the case. The movement is 8.89 mm thick. Caliber 9461 MC is a manually wound movement with a 48-hour power reserve. It vibrates at 21,600 vph. There are 233 components, including 23 jewels.
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