One of only 500, this discontinued perpetual calendar runs on a patented Ludwig Oechslin movement, from the mind behind some of Ulysse Nardin’s most inventive calibers. A collector’s piece past the usual Genevan names, hiding six complications in white gold behind the raw presence of the bull.

Presents itself in mint condition with little to no signs of wear. Layered black dial wears a Côtes de Genève finish, crossed by a black ceramic ‘T’ bridge pinned with blued screws, with day, month, and year apertures beneath skeletonized hands and the big date at one o’clock. Fixed black ceramic bezel sets a gold sun at noon and a gold crescent moon at midnight, a wink of gold against the black. Mirror-polished 18K white gold case sits cool against the matte black rubber, a sleeper in sport-watch clothing that flashes platinum-white in the light.

Functions include hours, minutes, small seconds, large date, day, month, year, leap-year cycle, full perpetual calendar, and GMT+/-. Screw-down crown commands the entire calendar, every display free to run forward or backward at once, safely and without a corrector tool. A blue arrow hand holds home time while the local hour jumps in clean one-hour steps via the ceramic pushers at 8 and 4. Cross the dateline and the date, day, month, and year all shift with the hour hand. A 48-hour power reserve sees it through a weekend off the wrist, backed by 100m of water resistance.

Comes as a full set, double-boxed with COSC chronometer certificate, “Perpetual Calendar with Dual Time Functions” operating manual, International Warranty and Customer Service cards, and leather card wallet.

Known as the El Toro, it holds a manufacture chronometer of real mechanical reputation under a name only the initiated catch. Discontinued years ago and made in tiny numbers, it rewards the collector who wants both complication and real dial presence.