Royal Oak Automatic Mechanical Watch

Skeletonised automatic-winding movement with hours, minutes, seconds, date, winding indicator, power-reserve indicator and declutchable variable-geometry rotor. The declutchable rotor works as follow: when the power reserve reaches 50 hours, the rotor is declutched automatically thanks to a specially developed gear system. As a result, the rotor is disengaged from winding the barrel. Conversely, when the power reserve decreases to 40 hours, the rotor is automatically clutched and the watch starts the winding phase until the indicator reaches 50 hours. It is possible to check theses phases thanks to the rewinding indicator located at 12 o’clock. It keeps the user informed whether the rotor is operating in winding phase (on) or is disengaged (off). Typical of Richard Mille, the declutchable rotor is a major innovation with its conception and miniaturization which represents an extraordinary technical challenge.