The Bianchet B 1.618 UltraFino represents a convergence of advanced horological engineering and meticulous design, encapsulated within a tonneau-shaped case. This timepiece is characterized by its ultra-thin architecture, measuring 8.9 mm in height, and its integration of a titanium automatic flying tourbillon movement, the UT01 caliber. The design is guided by the Golden Ratio (1.618), a mathematical principle that influences the proportions and aesthetic harmony of the watch. The UltraFino is available in two distinct versions: a skeletonized model that exposes the intricate movement and a dial version featuring a Golden Diamond pattern, a contemporary reinterpretation of the Clou de Paris motif.
The UltraFino offers two dial configurations, each reflecting a different interpretation of the watch’s design philosophy. The skeletonized version showcases the UT01 movement, with its hand-finished components and openworked architecture, allowing for a clear view of the tourbillon cage and the gold rotor adorned with Fibonacci spirals.
The dial version, on the other hand, features an exclusive Golden Diamond pattern, which is a modern adaptation of the traditional Clou de Paris design, inspired by the Golden Ratio. Both versions incorporate a rubber seam between the bezel and case middle, a signature element that underscores the watch’s craftsmanship and attention to detail.
At the core of the UltraFino lies the Bianchet UT01 caliber, an ultra-thin automatic flying tourbillon movement crafted from grade 5 titanium. The movement measures 3.85 mm in height and weighs 8 grams, making it one of the thinnest and lightest automatic tourbillon movements in the industry. The tourbillon cage, with a height of 2.66 mm, is designed to optimize vertical space while maintaining functional reliability.
The escapement architecture has been reengineered to reduce the risk of overbanking and to enhance shock resistance, ensuring chronometric precision even under demanding conditions. The movement features a suspended mainspring barrel, which provides a power reserve of over 60 hours, and a gear train optimized for thinness and transmission stability. The finishing of the movement includes a combination of sandblasted, satin-brushed, and hand-polished surfaces, creating a dynamic interplay of textures that highlight the complexity of its construction.
The case of the UltraFino is constructed from grade 5 titanium, a material chosen for its lightweight properties and durability. The tonneau-shaped case measures 40 mm in width and 47.39 mm in length, with a curvature of 1.2 mm from lug to lug, ensuring a comfortable fit on the wrist. The case is designed to withstand shocks of up to 5,000Gs and is water-resistant to 5 ATM (50 meters), making it suitable for everyday wear. The watch is available with two strap options: a fully integrated titanium bracelet that follows the contours of the case for a seamless aesthetic, and a vulcanized natural rubber strap with a titanium deploying buckle, offering an alternative for those seeking a more casual look.
The Bianchet B 1.618 UltraFino is a technical achievement in the realm of ultra-thin watchmaking, combining advanced materials, precise engineering, and a design philosophy rooted in the Golden Ratio. The UT01 movement, with its flying tourbillon and optimized escapement, exemplifies the brand’s commitment to performance and precision. The case, with its ergonomic design and robust construction, ensures both comfort and durability. Whether in its skeletonized or dial version, the UltraFino stands as a testament to the integration of mathematical harmony and mechanical innovation in contemporary horology.
