greubel forsey - Double Tourbillon Technique 30° Bi-color
Luc Virginius / Chronopassion
greubel forsey - Double Tourbillon Technique 30° Bi-color

Double Tourbillon Technique 30° Bi-color

greubel forsey
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599'500 €

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Double Tourbillon Technique 30° Bi-color

The Double Tourbillon Technique 30° Bi-color is a reinterpretation of our first invention, the Double Tourbillon 30°, which we initially built into timepieces of more conventional styling and classic architecture. Now we offer a new way of appreciating the subtleties of the invention with stunning contrasts between the platinum or 5N red gold of the case and the deep black chrome finish of the movement. Each version, platinum or gold, is made in a unique edition of just 22 timepieces. They are both bi-colour, but they have very different characters.
The version in 5N red gold is gentler in tone, with the warmth of the gold offering a less taut contrast between the red gold of the case (with the engraved black ADLC sideplates) and the black chrome movement components, each of which has its precise colour role in the harmonious overall picture. 
Journey to the heart of the mechanism
The Double Tourbillon Technique 30° Bi-color, an original and innovative interpretation of our first fundamental invention, the Double Tourbillon 30°, reconfigures its architecture in a diametrically opposed style, while providing a demonstration of mechanical skill.
The unique architecture draws you right into the mechanism. The synthetic sapphire-crystal is a kind of window looking onto an animated miniature world, a veritable jigsaw of pieces that takes your eye from one set of gears to the next. The details of each component reveal themselves as your gaze explores the timepiece. 
Transparency and harmony
This new timepiece is a perfect expression of Greubel Forsey’s ideals and spirit: transparency above all. Each element of the mechanism is magnified without overwhelming its neighbour, though the centrepiece of this watch remains the Double Tourbillon 30°. 
As a tribute to the ancestral craft of the watchmaker, and yet plant it firmly in the 21st century, new mechanisms have been incorporated into this watch, notably quadruple barrels, connected to the power reserve differential, that deliver 120 hours of running time.  
When you wind the movement, you can see the barrels rotating over and again. The transparent sapphire-crystal ring, on which the hour markers are inscribed, only takes up the inside rim of the bezel, allowing light to reach into every level of the mechanism. An equal concern for refinement is applied to the hands, which are opened for transparency. The sectorial power-reserve indicator can be found at 3 o'clock, and the circular subdial of the small seconds at 9 o'clock, their bright red hands, symbolising air and life, illustrate our thirst for technical modernity.  
The Spirit
With the open architecture of this timepiece we have once again sought to demystify our art by displaying it openly. In our inventions we strive not only for supreme workmanship, quality and reliability, but also for visibility.  This Double Tourbillon Technique 30° Bi-color is made to be shared. That is what we commit to in the message engraved in relief on the black ADLC plate on the left side of the case. The text expresses our total devotion to our art with the firm intention of taking it forward, as well as reflecting on the complex structure of the movement. But it is fundamentally a matter of needing to share our boundless enthusiasm for precision timekeeping. On the crown side, a group of key words sum up these fundamental values. 
This philosophical framework gives maximum expression to the decoration of the movement. The sharp internal corners are all bevelled and hand-finished. In keeping with tradition, the mainplate and bridges are in frosted Nickel-silver with a black chrome finish. The Tourbillon bridge remains in steel, bevelled and flat black polished by hand. It contrasts with the gold hands matching the new case in 5N red gold or platinum. This case measures 47.5mm by 16.84mm, and it is enhanced by side plates in titanium with black Amorphous Diamond Like Carbon (ADLC) coating recounting the story of the inventors. The Greubel Forsey spherical differential can be found at 1:30, here applied to the power-reserve indicator at 3 o'clock, with its swan’s neck bridge and beak hand. The star of the show can be found at 6 o'clock: the Double Tourbillon 30° beating at 21,600v/h. Its first carriage rotates horizontally in four minutes; its second, inclined at 30°, goes around in one minute. Small seconds display at 9 o'clock. Finally at 11 o'clock, fast-rotating, superimposed quadruple barrels with protection against excess tension counterbalance the double tourbillon. They provide 120 hours of precision timekeeping in a total running time of 160 hours. Noticeable in the centre is a special tripod structure that firmly supports the hands. A final glimpse, a similar structure supports the spherical differential for the winding system on the movement side.

Technical specifications

Double Tourbillon 30° Technique Bi - color
Unique edition of 22 pieces in 5n red gold
with engraved black ADLC titanium plates
Mechanical hand-wound movement with patented tourbillon
Calibre GF02s
Double Tourbillon 30° • hour and minute display • small second display • outer tourbillon 4-minute
rotation indicator • inner tourbillon 60-second display • power-reserve indicator
Movement dimensions
• Diameter: 38.40 mm
• Thickness: 12.15 mm
Number of parts
• Complete movement: 385 parts
• 2 tourbillon cages: 132 parts
• Total weight of the two cages: 1.22 g
Number of jewels
• 43
• Olived-domed jewels in gold chatons
Power reserve
• 120 hours
• Four coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• 22k gold cover with nickel-palladium treatment and relief engraving
Balance wheel
• Free sprung variable-inertia balance with white gold mean-time screws (10.70 mm diameter)
• 21’600 vibrations/hour
Balance spring
• Phillips terminal curve
• Geneva-style stud
Main plates
• Nickel silver, frosted with hand bevelling, black chrome treatment
• Nickel silver, frosted, spotted with hand bevelling, black chrome treatment
• Gold plate engraved with the individual number
Inner tourbillon
• Inclined at a 30° angle, 1 rotation per minute
Outer tourbillon
• 1 rotation in 4 minutes
• Hand-bevelled and openworked cage pillars
• Gold counterweight
• Involute circle profile
• Conical gearing with corrected profile
• Hour and minute
• Small second
• 120-hour power reserve on a sector
• 4-minute outer tourbillon rotation indicator
• In 5N red gold with convex synthetic sapphire crystal
• Transparent back with synthetic sapphire crystal
• Raised polished engraving “Double
Tourbillon 30°” on a hand-punched background
• Three-dimensional, variable geometryshaped
lugs, screwed fixing
• Gold security screws
• 2 black ADLC titanium engraved and handfinished plates bearing text screwed to the caseband
• Hand-engraved individual number
Case dimensions
• Diameter: 47.50 mm
• Thickness: 16.84 mm
Water resistance of the case
• Water-resistant 3 atm - 30 m - 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
• 5N red gold with engraved and black lacquered GF logo
• Synthetic sapphire crystal hour-dial
• Small second and power-reserve indicators in gold
• Hour and minute in polished gold with Super-LumiNova
• Small second, power reserve (red triangles)
• Synthetic sapphire crystal 4-minute engraved indicator
Strap and clasp
• Hand-sewn black alligator
• 5N red gold folding clasp, hand-engraved with the Greubel Forsey logo
Double Tourbillon Technique 30° Bi-color.

Who's who

“The first time I met Robert Greubel, he was working on Richard Mille’s Planetarium Tellurium. When I saw him at work, I immediately understood that he was a real high-flier – and that at that altitude, he wouldn’t be meeting many other people.” Laurent Picciotto’s earliest memory of the co-founder of what was to become “Greubel Forsey” speaks volumes about the master watchmaker’s personality. For once, the term is no exaggeration: Robert Greubel really does master watchmaking, from design right through to the production of each component.

Robert Greubel grew up in Alsace and began his career in the family business, Greubel Horlogerie. He then moved to Switzerland to work for the International Watch Company (IWC), where he helped develop their Grande Complication. Three years later, he joined independent designers Renaud & Papi (later bought out by Audemars Piguet) as a prototypist for complications. He quickly rose to the position of managing director and then partner. At the turn of the century, his career took a new turn, too. In 1999, Robert Greubel began working independently and met his future partner, Stephen Forsey. Laurent Picciotto holds the latter in the same admiration: “As well as being a man of erudition, Stephen is also the kindest and most approachable person working in top watchmaking”, he says. Stephen Forsey’s career began in England: he was brought up in St Albans by his father, who was deeply interested in mechanics and engineering.

From 1987 to 1992, he specialised in restoring timepieces, becoming managing director of Watch Restoration in London. He travelled to and from Neuchâtel on numerous occasions to follow the WOSTEP watchmaking training course – until the day in 2001 when he made a one-way trip, settling down permanently in Switzerland to set up Complitime with Robert Greubel. Based in La Chaux-de-Fonds, the company produces complicated movements for major brands. Then in 2004, the two partners quit their jobs and officially registered their own brand, Greubel Forsey. “Initially, I was mostly aghast, largely due to their business model,” recalls Laurent Picciotto.

“Commercial strategy was the least of their worries; they were focused on doing extremely complex work in order to produce a tiny number of items... It was crazy!” Right from the start of that year’s BaselWorld, the brand’s degree of technical complexity made an impact. The very first timepiece was none other than a Double Tourbillon 30°. The brand’s DNA was already visible – a core business focusing on the tourbillon, with one hundred percent hand finishing to the highest standards of haute horlogerie. Stephen Forsey later explained that an item such as the Tourbillon 24 seconds requires 350 hours of work on finishings.

Harry Winston soon spotted the brand’s potential. As early as 2006, the firm entrusted them with the production of its Opus 6. From then on, Greubel Forsey continued to push back the boundaries of top watchmaking in a constant quest for precision, presenting outstanding items such as the Tourbillon 24 Seconds Incline and the Differential Quadruple Tourbillon. Such an unusual brand was bound to find its place in the Chronopassion collections: “Over time, Greubel Forsey has successfully made its mark with timepieces that ultimately, are self-evident for everybody. Stephen and Robert really are on a quest – they’re obsessed! Their fascination with mechanics is contagious. There’s a sense of “pure research” in their items. At the end of the day, you’re never sure of fully understanding a Greubel Forsey. That’s what makes them so special.” 

Journalist : Olivier Müller

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