As with past examples of the form, the white gold Overseas Perpetual Calendar Ultra-Thin houses the brand’s very complicated caliber 1120 QPSQ/1 movement. Automatically wound and tracking hours, minutes, moon-phase, and a complete perpetual calendar (date, day, month, leap year), the 1120 is just 4.05mm thick. Despite that, this Hallmark of Geneva certified movement contains 276 parts supporting a 40-hour power reserve while running at 2.75 Hz.