BIANCHET Tourbillon B1.618 Openwork Carbon

The tonneau-shaped Tourbillon B1.618 Openwork watch by creative contemporary Swiss watch brand BIANCHET was conceived and designed according to the principles of the Golden Ratioof 1.618 and the Fibonacci sequence.

In 2020, the brand launched the Tourbillon B1.618 Openwork with a titanium case that measures 43 mm in width, 50 mm in height (length) and 13 mm in thickness. From the side, the top and bottom of the watch follow a curve. The superposition of these two lines, the colored seam, the thickness of the bezel, the play on heights – they are guided by the Fibonacci sequence.

BIANCHET has now added a new version with a carbon case, with the accent in blue. The composite material has a special formulation: titanium powder has been added to the carbon fibers.

BIANCHET Tourbillon B1.618 Openwork Carbon

Together, the two materials create a moiré effect that alternates between shiny and matte in a random pattern unique to each piece. The curvature and lightness of the Tourbillon B1.618 Openwork provide a feeling of completeness and harmony. It naturally flows from the Golden Ratio.

BIANCHET Tourbillon B1.618 Openwork Carbon

Skeletonized, the complex mechanical calibre of the watch is made entirely of black DLC titanium. It was designed and developed and is now manufactured by Bianchet in La Chaux-de-Fonds, in the heart of the Swiss watchmaking industry. The process of making a Bianchet is focused as much on quality as on technical excellence, the main objective being to obtain a perfect balance between form and function. The Tourbillon B1.618 Openwork has a power reserve of 105 hours.

BIANCHET Tourbillon B1.618 Openwork Carbon

The design of the B1.618 caliber is unique. It features a curved and open-worked tourbillon bridge. The barrel bridge responds with perfect symmetry. The floating and skeletonized flange is simply amazing. The structures and textures have shades of black that cut across.

BIANCHET Tourbillon B1.618 Openwork Carbon

The short lugs enhance wear comfort. The supple strap made from natural rubber naturally follows through. The sporty elegance of the distinctive color seam that intersects the various parts of the case – be it in carbon or titanium.

This through-line is an unmistakable signature of the brand. The seam, functional and following a specific cut, first embedded then adjusted by hand between the different components, highlights the case’s curvature. It also defines a chromatic theme, extending to the hands and hour markers as well as to crown’s rubber insert and the strap.

BIANCHET Tourbillon B1.618 Openwork Carbon

A sporty-chic creation, the Tourbillon B1.618 Openwork is water-resistant to 50 meters (5 ATM) in the titanium version, 30 meters for the carbon version and features a crown guard. The watch is guaranteed for five years. The movement components are made of Grade 5 titanium, including the bridges of the tourbillon cage. The material’s low weight and high rigidity further enhance the calibre’s reliability.

BIANCHET Tourbillon B1.618 Openwork Carbon

With the metal used for the components and case, the Tourbillon B1.618 Openwork in titanium weighs in at less than 55 grams. The carbon version weighs 33 grams without the bracelet.

Technical details

Model: BIANCHET Tourbillon B1.618 Openwork– Carbon

Features
Shock resistance: up to 6000 G
Power reserve: approx. 105 hours (+/-5%)
Water resistance: 30 meters (3 ATM)
Weight:33 grammes
Imagined, developed and made in Switzerland
Movement: 100% Swiss Made
Case: 100% Swiss Made (except the sapphire crystal)
Strap: 100% Swiss Made
Warranty: 5 years

Case
Carbon fiber and titanium powder composite
Crown: Grade 5 titanium
Finishes: by hand
Sapphire crystal with antireflective coating, case front and case back
Case dimensions: 43 x 50 x 13 mm

Movement
Calibre B1.618
Materials: Main plate, bridges and tourbillon cage in grade 5 titanium
60-second tourbillon: hand-wound
Frequency: 3hz – 21,600 vph
Tourbillon cage bridges in antimagnetic titanium
Variable inertia balance wheel
Lubricants with diamond nano-particles to reduce friction
Finishes: plate and bridges in sandblasted titanium, circular-grained and satin-brushed, polished bevels, black DLC finish

Strap
Organic vulcanized rubber
Grade 5 titanium buckle

Price
46,500 CHF (WT)

Model: BIANCHET Tourbillon B1.618 Openwork– Titanium

Features
Shock resistance: up to 6000G
Power reserve: approx. 105 hours (+/-5%)
Water resistance: 50 meters (5 ATM)
Weight: 54 grammes
Imagined, developed and made in Switzerland
Movement: 100% Swiss Made
Case: 100% Swiss Made (except the sapphire crystal)
Strap: 100% Swiss Made
Warranty: 5 years

Case
Grade 5 titanium and organic vulcanized rubber
Crown and buckle: Grade 5 titanium
Finishes: Satin-brushes, sand-blasted with mineral sand and hand-polished with natural fibers
Sapphire crystal with antireflective coating, case front and case back
Case dimensions: 43 x 50 x 13mm

Movement
Calibre B1.618 movement
Materials: Main plate, bridges and tourbillon cage in grade 5 titanium
60-second tourbillon: hand-wound
Frequency: 3hz – 21,600 vph
Tourbillon cage bridges in antimagnetic titanium
Variable inertia balance wheel
Lubricants with diamond nanoparticles to reduce friction
Finishes: plate and bridges in sandblasted titanium, circular-grained and satin-brushed, polished bevels, black DLC finish

Strap
Organic vulcanized rubber
Grade 5 titanium buckle

Price
44,500 CHF (WT)