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JAY-Z, the 24-time Grammy winner and longtime watch collector, debuted his $350,000 Bugatti Chiron Tourbillon in August at Fanatics Fest in New York City.

It has an inclined tourbillon, a feature aimed at improving accuracy by counteracting gravity, which adds to its rarity in the watch world.

That was followed almost immediately by Piaget, in its 150th anniversary year, issuing what it identified as the world’s thinnest tourbillon: the Altiplano Ultimate Concept Tourbillon, which at two millimeters all but sucks the third dimension out of the whirring anti-gravitational tourbillon device so loved by elite watchmakers.

But it contained neither the tourbillon cage that surrounds the watch’s oscillating escapement nor the 30 percent additional power required to fuel it.

The two horologists bonded over their shared interest in timepieces made by Breguet, of which Bloomfield owned many important examples, Crisford said, including a pocket watch that housed the world’s first tourbillon — a mechanism that improves timekeeping by suspending componentry in a rotating cage.