Rotonde de Cartier 9907 MC Calibre Watch – Innovation from Cartier
This Cartier new Rotonde de Cartier 9907 MC calibre watch is known for the primary innovative feature of the isolated chronograph display in the center of the dial. This ingenious arrangement offers both exceptional legibility of this traditional complication and a novel way of displaying the time. Timekeeping occurs on two levels: the lower level is devoted to showing the hours and minutes using blue hands which are invisible save for the tips, while the upper level is designed for chronograph function. At the centre, the slim blued seconds hand begins to move when the corresponding push-piece is pressed, while the large counter in the form of an arc records each of its revolutions up to 30 minutes. Thus, the hands indicating time never obscure those of the chronograph. The central chronograph counter is held as if weightless above the dial by a sapphire ring, whose discreet presence adds to the complexity of this construction, for which a patent request has been registered. The chronograph has displayed excellent craftsmanship of Cartier. This 9907 MC calibre is equipped with a complex transmission system for the chronograph function. In fact, a column wheel controls the three chronograph functions (start, stop and reset), whereas in the majority of chronographs, this wheel is replaced by a cam system. Bwsudes, the design also involves less components than usual — 272 parts in total. This reduction brings both improved watch maintenance and better long-term endurance. With a diameter of 25.6 millimetres, and a height limited to 7.10 millimetres, the Cartier 9907 MC calibre has managed to integrate all functional elements in a relatively limited space. More importantly, we have seen the watchmaking genius of vertical coupling in this Cartier masterpiece. In fact, the Cartier watchmakers decided to substitute the usual horizontal release system mounted on a lateral yoke, which requires a large amount of energy, for a vertical alternative with an extremely modern design. We are thus moving from a gear-train mechanism to one that works with friction. Analogous to the clutch system of a car, this system works by adherence, or in other words, by reciprocal pressure that is controlled very precisely by two small disks. Designed to reduce the energy consumption of the chronograph function, this vertical coupling system conserves exceptional chronometric precision despite the addition of a supplementary function.
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