At the 26th Grand Prix d’Horlogerie de Genève, La Vallée’s COSMO claimed the Mechanical Clock Prize with a concept that feels both audacious and inevitable: an entire 14.5-kilogram mechanism, magnetically suspended and rotating on its own axis once every sidereal day.
One rotation sets a quiet choreography in motion. By exploiting relative speeds across concentric elements, COSMO displays standard time, solar time, day, date, month, zodiac, sunrise, sunset, dawn, dusk, twilight, the apparent position of the Sun and stars, and daylight saving time for a chosen location. It is a planetarium that minds the minutes.
Underneath the poetics sits a ruthlessly pared engine. A patented transmission built on only two eccentric gears powers everything directly from the mainspring: the mono-component flexure-based remontoire, the large low-frequency escapement regulated by a 70 mm magnetically suspended balance, and the continuous rotation of the whole mechanism. The reward is 406 days of autonomy from a single wind, with integrated stopwork and power reserve indication.
The escapement is a study in efficiency. A one-minute flexure remontoire meters energy in clean parcels. A redesigned pallet fork and escape wheel pursue ideal geometry for minimal loss. The magnetically suspended balance is laterally guided by rubies while opposed, shielded magnets shoulder its weight and tame stray fields. La Vallée’s trilobe Delta-T balance architecture allows thermal compensation by design, not by hope.
The dome is not a cover but a tool. Hand-blown Murano glass becomes both user interface and celestial vault: you wind and set through it, you read the sky upon it, and, at the owner’s request, you let it act as an acoustic resonator that amplifies the beat. A discreet central knob stops and locks the escapement for transport, restarts it on command, or lifts it to kiss the glass for a louder heartbeat.
There is personalization with purpose. COSMO can be configured to beat at the owner’s resting heart rate. The astrolabe may be tailored to a specific city, even marking a favorite star. By day, the mechanics speak plainly. By night, time and the heavens take over, and the room grows quieter.
COSMO is not complexity for its own sake. It is a search for impossible simplicity, rendered in eccentric gears, patient torque, and a universe turning on cue.
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