greubel forsey - Tourbillon 24 Secondes asymmetric in platinum
Luc Virginius / Chronopassion
greubel forsey - Tourbillon 24 Secondes asymmetric in platinum

Tourbillon 24 Secondes asymmetric in platinum

greubel forsey
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410'000 €

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Tourbillon 24 Secondes asymmetric in platinum

With the Tourbillon 24 Secondes Incliné (Calibre GF01), Greubel Forsey capitalizes upon the speed of rotation and the inclination of the regulator to harness the influence of gravity on the regulating organ. Enabling the moving parts to cover a major distance in a short space of time and to perform a complete rotation in just 24 seconds called for the implementation of innovative solutions including a specially constructed inclined gear profile. The use of extremely low-density alloys stemming from the aeronautical and aerospace industries facilitated the creation of a unique and ultra- light Tourbillon system inclined at a 25° angle, perfectly suited to the powerful stresses imposed by the speed and in particular by the cage advancing in steps which are two and a half times greater than in conventional tourbillon systems. The construction of the Calibre GF01 has off-centred the Tourbillon 24 Secondes Incliné system, a technical option that provided scope to define an original case and dial architecture characterised by a well-balanced asymmetry. The latter serves to ensure ideal visual access to the mechanism and to the various items of information.

Technical specifications

Movement
Movement dimensions
• Diameter: 36.40 mm
• Thickness: 9.35 mm
Number of parts
• Complete movement: 282 parts
• Tourbillon cage: 88 parts
• Weight of the cage: 0.39 g
Number of jewels
• 36
• Olived-domed jewels in gold chatons
Power reserve
• 72 hours
Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension Balance wheel
• Free sprung variable-inertia balance with gold mean-time screws (10 mm diameter)
Frequency
• 21’600 vibrations/hour
Balance spring
• Phillips terminal curve
• Geneva-style stud
Main plates
• Nickel silver, spotted and snailed, with polished bevelling, nickel-palladium treatment Bridges
• Nickel silver, frosted and spotted, with polished bevelling, nickel-palladium treatment
• 3 engraved gold plates (1x Greubel Forsey, 1x individual number, 1x name of the invention)
• Flat polished steel tourbillon bridge
• Black PVD-coated titanium platform under
the tourbillon and polished backdrop
Tourbillon cage
• Inclined at a 25° angle, 24-second rotation
• Cage pillars in Avional
• Titanium cage bridges
• Gold counterweight
Gearing
• Involute circle profile
• Tangential inclined gear with profiled teeth, on fixed wheel and escape wheel pinion
Displays
• Hour and minute
• Small second on a sector
• 72-hour power reserve on a sector
• 24-second tourbillon rotation indicator at 8 o’clock
Exterior Case
• Platinum 950 with asymmetrical convex synthetic sapphire crystal
• Transparent back with asymmetrical convex synthetic sapphire crystal
• Lateral window with shaped synthetic sapphire crystal
• Three-dimensional, variable geometryshaped lugs
• Raised polished engraving “Tourbillon 24 Secondes Incliné” on a hand-punched
background
• Gold security screws
• Polished bezel, centre band with handfinished straight graining
• Hand-engraved individual number
Case dimensions
• Diameter: 43.50 mm
• Thickness: 16.11 mm
Water resistance of the case
• Water-resistant 3 atm - 30 m - 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown
• In platinum with engraved and black lacquered GF logo
Dial
• Gold dial, anthracite colour
• Gold hour markers
• Gold display sectors
• Relief-engraved zone of text
• 1 engraved gold plate with the individual number
• Applied gold Greubel Forsey logo
Hands
• Hour and minute in gold with Super- LumiNova, small second and power-reserve in polished gold
• 24-second double-tipped hand, black anodised aluminium
Strap and clasp
• Hand-sewn black alligator
• Platinum 950 folding clasp, hand-engraved with the Greubel Forsey logo
 

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.”

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