Bianchet B 1.618 UltraFino: Architecture of Time Inspired by the Golden Ratio
<p data-start="411" data-end="951">The Bianchet B 1.618 UltraFino is unlike anything else in today's watchmaking landscape. It does not seek to im
The Bianchet B 1.618 UltraFino is unlike anything else in today's watchmaking landscape. It does not seek to impress through excess or gratuitous complexity, but through a simple and powerful idea: harmony. Its entire design is based on a single constant, one that has fascinated artists, mathematicians, and architects since antiquity: the golden ratio. And it is this obsession with perfect balance that gives rise to an ultra-modern, radically contemporary, yet deeply poetic watch.
Created in 2025 and presented at Geneva Watch Week, this UltraFino marks a new milestone for the young Swiss brand founded by Rodolfo and Emmanuelle Festa Bianchet. Since its inception, the brand has sought to translate universal mathematical principles into exceptional objects. And with this piece, it takes a major step forward. The B 1.618 UltraFino is not just a skeleton watch, nor a simple exercise in style: it is a mechanical sculpture worn on the wrist.
The grade 5 titanium tonneau case, measuring 43 mm in width and just 8.9 mm in thickness, defies the standards of its genre. Despite its size, it is easily forgotten once on the wrist, thanks to its perfectly calculated curvature, measuring 1.2 mm in accordance with the famous golden ratio. Every line, every curve, and every detail of the case follows this logic of proportion. This is watchmaking that speaks of pure aesthetics, but also of sensation. The watch hugs the wrist, merging with it. And in this fusion, it comes to life.
Mechanically, the feat is equally impressive. The UT01 calibre is an automatic flying tourbillon movement of extreme thinness, measuring just 3.85 mm thick. Entirely developed in-house, it combines lightness (thanks to the use of titanium) with robustness. It can withstand shocks of up to 5,000G, an impressive performance for such a thin watch. But what truly stands out is the presentation of the movement. The suspended barrel, the openworked bridges, the vertical positioning of the gear train: everything is designed to create a play of space and light. You do not watch time pass; you observe a mechanical choreography.
Then there is the solid 22-carat gold rotor, decorated with 12 Fibonacci spirals. A direct nod to the mathematical foundations of the universe, and a discreet tribute to the beauty hidden in simple things. Here again, everything is coherent. Nothing is ostentatious; everything is inspired. The result is a watch whose architecture is as important as its function. An object designed to be worn, admired, and also contemplated.
The Bianchet B 1.618 UltraFino is available in two versions: one with a solid dial, which is more minimalist, and a skeletonized version that reveals the entire mechanism. In both cases, production is limited to 100 pieces per year. This figure reflects a desire to remain artisanal and human, far from industrial logic. The watch is mounted on an integrated titanium bracelet, which reinforces its seamless design, and the folding clasp also follows the lines of the case.
Priced at around €50,000, it is naturally aimed at a discerning, passionate clientele who are not necessarily looking for a status brand, but rather an object with true personality. It is a watch for those who appreciate rare, coherent, and deeply thought-out creations.
Conclusion
The Bianchet B 1.618 UltraFino is a lesson in contemporary watchmaking. It proves that it is still possible to surprise in design, technique, and concept. It translates a vision of time that is meant to be felt as much as it is watched. A timepiece for those who want to feel harmony right down to the beating of their wrist.
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