A quick look at the detailing for Richard Mille’s RM 30-01:

Clutch engagement and power-reserve indicators

The clutch engagement indicator is a real technical feat.

Positioned at 11 o’clock is the control centre for managing the calibre’s energy, and to know whether the rotor is operating (on) or disengaged (off).

When the power reserve reaches 55 hours, the rotor is automatically declutched via a dedicated mechanism and uncoupled from the barrel.

The power-reserve indicator in the centre of the dial shows how much energy is available.

Function selector

Inspired by automotive gearboxes, the function selector is easy to use, thanks to a pusher integrated into the caseband at 2 o’clock.

One can choose to either set the time, wind the calibre or set the date.

This system minimises constraints on the crown, and any interference possible between the movement and the crown’s functions.

Declutchable variable-geometry rotor