UltraFino Rotondo
Model History
Until the launch of the UltraFino line in 2025, Bianchet's entire catalogue had developed around the tonneau shape of the B 1.618 collection. The UltraFino Rotondo therefore marks a turning point in the brand's history: it is the first Bianchet watch to offer a round case, 39.5 mm in diameter, as well as the first to house an automatic-winding movement, replacing the manual calibres that had characterized previous models.
The name "UltraFino" refers to the particularly slim thickness of the in-house UR01 calibre, just 3.85 mm, which allows the complete case to stay at 8.9 mm: a result that places the model among the small number of ultra-thin automatic tourbillon watches, a non-trivial technical achievement given the typical bulk of a tourbillon cage.
The skeletonized dial leaves much of the movement's architecture visible, with applied indices serving as time references, while the case is offered in grade 5 titanium or in an ultra-lightweight carbon version, both fitted with an integrated bracelet featuring a quick-change system — a solution that allows the included rubber strap to be swapped without tools.
Technical Specifications
Main Executions
The UR01 calibre states a shock resistance of 5,000 G despite its extreme thinness — a notable figure, since a reduced thickness normally makes the tourbillon cage more vulnerable to shocks: Bianchet presents this balance between lightness and robustness as one of the model's most significant technical achievements.