Bianchet UltraFino Rotondo – Geometry Finds Its Circle

Bianchet introduces the UltraFino Rotondo, a round flying tourbillon that translates the Maison’s golden ratio thinking into a pure circle. It is the same measured voice the brand has cultivated, now speaking in a universal form.

The round case is deliberately clean, its bezel free of screws or distractions so the openworked tourbillon takes center stage. A discreet rubber seam under the bezel brings subtle color accents, echoed on the second rubber strap and on the hands of the carbon edition. Curves and crisp facets play against each other, the brand’s dynamic tension rendered in light and shadow. Proportions follow 1.618 across case, bridges, rotor, and movement architecture, so the eye reads harmony without effort.

Inside beats the in-house Calibre UR01, an ultra-thin automatic flying tourbillon at 3.85 mm and under 8 grams, comprising 225 components and 29 jewels. The titanium tourbillon makes a 60 second rotation, the suspended barrel frees vertical space for a 60 hour reserve, and a solid 18K rose gold rotor supplies winding mass. A bespoke winding and setting system reduces friction and height. Shock protection is applied at balance and structural points, unusual for such a thin automatic tourbillon. Finishing is hand led in La Chaux-de-Fonds, with 30 plus hours of anglage on Grade 5 titanium bridges, a hard road few attempt.

Despite an 8.9 mm profile, the Rotondo is water resistant to 100 m and engineered for shocks up to 5,000 G. In carbon it weighs 48 grams with bracelet, in Grade 5 titanium 75 grams, which is to say it more or less disappears until you check the time. Both versions come on integrated bracelets with an additional rubber strap and titanium folding clasp.

The case measures 39.5 mm by 8.9 mm, with sapphire crystals front and back and a fully openworked dial. The movement runs at 3 Hz with a screw balance. Prices are CHF 62,500 for titanium and CHF 67,500 for carbon, both excluding taxes.

Verdict, spoken softly. The Rotondo holds Bianchet to its word that form leads and function follows, yet here function keeps pace. In the circle, clarity. In the tourbillon, calm motion. Less noise, more intent.