B 1.618 UltraFino 40mm
UFFTSKSPWH · B 1.618 UltraFino Sapphire
How it wears
Wears true to its 40 mm case size
Bianchet B 1.618 UltraFino 40mm measures 47.5 mm lug-to-lug on a 40 mm case, a lug-to-lug ratio of 1.19 against a database median of 1.18. That span is longer than 56% of the 7,421 watches in this database and longer than 28% of the 29 Bianchet watches listed.
A flat wrist width of 53 mm (2.09 in) or more keeps it in the balanced range, and from 64 mm (2.52 in) it starts to look compact. Below 47.5 mm (1.87 in) the lugs are likely to overhang the wrist. Flat wrist width is measured straight across the top of the wrist, not around it.
At 9.8 mm thick it is on the slim side, thinner than 87% of the watches with a listed thickness.
Wrist fit analyzer
Fit reference
Sits comfortably within the wrist width for most wearers.
Sources
- https://timeandtidewatches.com/bianchet-ultrafino-sapphire-introducing/
Time+Tide article table lists reference UFFTSKSPWH with case dimensions 40mm (D) x 9.8mm (T) x 47.5mm (LTL).
- https://www.hodinkee.com/articles/five-of-the-wildest-watches-from-geneva-watch-days-2025
Hodinkee reports 47.5mm lug-to-lug, 40mm case size/width, 9.8mm thickness for Bianchet Ultrafino Sapphire in “Five Of The Wildest Watches From Geneva Watch Days 2025.”
- https://monochrome-watches.com/bianchet-ultrafino-sapphire-tourbillon-automatic-introducing-price/
MONOCHROME reports 47.5mm lug-to-lug, 40mm case size/width for Bianchet B 1.618 UltraFino Sapphire in “The new Bianchet UltraFino Sapphire.” The article's explicit planar case length/top-to-bottom dimension is stored as the lug-to-lug equivalent.
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