The tilt is the idea
By Marco Bellini, Zurich ·
A normal tourbillon turns once a minute in the plane of the movement. When the watch lies flat that rotation does nothing useful, because the balance is already horizontal. Greubel Forsey tilted the cage at 25 degrees and spun it once every 24 seconds, so the balance never sits fully flat or fully upright, and the averaging a tourbillon is supposed to do actually happens across more positions.
That I respect. Could you see the difference on a wrist? That's another discussion, and I won't pretend to know the answer.
Finishing is the reason this brand exists. Bevels by hand, black-polished steel, frosted surfaces, the kind of work that turns a bridge into something you want to look at with a loupe.
43.5 mm by 16.1 mm is a big slab of platinum. 72 hours. 30 m.
350,000 to 420,000 USD. Ma dai. For the collector who wants the most serious tourbillon argument made in metal. If you only want a spinning cage, there are cheaper ways to get one.