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Designed to compensate for the detrimental effects of gravity on the movement, the Tourbillon is one of the most challenging horological accomplishments. In this Grand Tourbillon Perpetual complication watch, the Tourbillon carriage is beautifully highlighted through a generous opening in the lower part of the dial. It is complemented by an impressive array of additional functions: Equation of Time, displayed in a window just above the center of the dial, to help keep track of the difference between sidereal time and civil time used on Earth; Perpetual Calendar indications, including days of the week, months, retrograde date and leap-year cycle on the backside; finally a precision Moon-phase display, also on the backside, calculated on the true synodic period of the moon. All perpetual calendar indications can be independently set by means of two pushpieces at 2 and 10 o’clock and two recessed correctors at 4 and 8 o’clock, or else adjusted simultaneously by the corrector at 9 o’clock.