Ulysse Nardin Classic Ulysse Anchor Tourbillon White Gold — Blue Dial | Ref. 1780-133/93

Among all the horological complications that Ulysse Nardin has pioneered, the Ulysse Anchor Escapement stands as perhaps the most conceptually audacious: a replacement for the Swiss lever escapement — the de facto standard for more than two centuries — with a constant-force mechanism fabricated entirely from silicium. This 44 mm white gold reference houses the Calibre UN-178, a hand-wound movement whose flying tourbillon is governed by the silicon Ulysse Anchor Escapement, a device so radical in its geometry that it required a decade of development before entering series production. The flying tourbillon — rotating once per minute — compensates for gravitational error in the vertical positions, while the constant-force function ensures that impulse delivered to the balance wheel remains uniform regardless of mainspring tension state.

The 170-hour power reserve of the UN-178 is remarkable in the context of a tourbillon movement: where conventional flying tourbillons typically achieve 50 to 70 hours, the silicon escapement's dramatically reduced friction and the elimination of lubrication at the escapement surfaces enable the mainspring energy to be dispensed with extraordinary efficiency. The 18-carat white gold case provides a neutral, cool-toned frame that focuses attention on the dial rather than competing with it, while the sapphire crystal allows full appreciation of the tourbillon's gyroscopic rotation from the dial side. The simple buckle on the leather strap maintains the classical restraint appropriate to a grand complication of this stature.

The blue dial creates a rich chromatic backdrop against which the tourbillon bridge and anchor escapement geometry are best appreciated — the deep cobalt surface throws the architecture of the escapement into relief in a way that paler dials cannot achieve. Water resistance to 30 metres reflects the priority hierarchy of a dress tourbillon: the movement's complexity demands protective humidity management, but this is a watch designed for rarified social contexts, not aquatic adventure. At $70,625 the Classic Ulysse Anchor Tourbillon represents one of the most technically justifiable investments in the entire Ulysse Nardin catalogue — a watch that exists not merely as a luxury object but as a functioning demonstration of silicon microfabrication at the highest level of watchmaking ambition.