GREUBEL FORSEY – Balancier Convexe S² Ceramic Edition

GREUBEL FORSEY – CONVEXE Balancier Convexe S²  GF09XV Black and White Ceramic 41.5 mm Edition 2026

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 BALANCIER CONVEXE S² | GF09XV THE CLOSING CHAPTER

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Greubel Forsey unveils the final two editions of the Balancier Convexe S² – one in black ceramic and 5N red gold, the other in white ceramic – marking the conclusion of a calibre developed and built over the past five years. Each edition is limited to only 11 timepieces, making them the most exclusive executions of the series. 

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Housed in the signature Convexe case measuring 41.5mm across the caseband and built around the hand-wound 30° inclined balance wheel sys- tem, these editions represent the definitive ex- pression of the Balancier Convexe S² movement. With their release, the calibre enters its final phase: production will cease permanently in 2026, closing this chapter of Greubel Forsey’s mechanical development.

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From its origin, the Balancier Convexe S² was de-signed as a fully integrated object in which case geometry and movement structure evolve together. 

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The Convexe architecture follows the natural curvature of the wrist, allowing the three-dimensional movement to remain balanced, legible and comfortable in daily wear. 

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Rather than enclosing the calibre, the case extends its architecture outward, reinforcing the dialogue between exterior form and mechanical construction. 

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At the heart of the movement lies Greubel Forsey’s 30° inclined balance wheel system, positioned as the visual and chronometric centre of the composition. 

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The movement is built around openness and perspective, with multi-level bridges and suspended structures designed to reveal rather than conceal mechanical function. 

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Composed of 301 components, with an escapement platform of 68 parts, the calibre combines structural lightness with technical density. Two fast-rotating coaxial barrels provide a 72-hour chronometric power reserve, while the in-house variable-inertia balance with six gold mean-time screws operates at 21’600 vibrations per hour.  The finishing philosophy remains fundamental to the identity of the timepiece. 

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 Titanium bridges and main plates are frosted and hand-finished with polished bevels, countersinks and carefully executed transitions between surfaces. 

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Every component is treated with the same level of attention, including areas that remain largely unseen, reflecting a consistent approach to execution where integrity of construction prevails over visibility. 

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The two final editions express contrasting visual identities while sharing the same mechanical foundation. 

The black ceramic and 5N red gold edition emphasises contrast and depth. 

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Black-treated movement components and the ceramic case frame the architecture, while the red gold bezel and caseback introduce warmth and visual weight. 

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The interplay between matte and polished surfaces amplifies the three-dimensional character of the movement and reinforces the sculptural nature of the Convexe case. 

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The white ceramic edition explores the opposite approach. The monochromatic light-toned case accentuates openness and precision, allowing the movement to emerge through light and shad-ow. 

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The result is a more technical and graphic expression, where structure becomes the primary visual language. The white ceramic construction highlights the purity of the Convexe geometry while preserving the same mechanical depth and legibility.

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Both editions retain the essential functional layout of the Balancier Convexe S²: hours and minutes displayed on a suspended arch bridge, small seconds, and a sector power-reserve indication. 

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The curved sapphire crystals, three-dimensional bezel geometry and profiled lugs reinforce the continuity between movement architecture and exterior form, maintaining the balance between presence and we arability that defines the Convexe approach. 

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These two editions complete a five-year exploration of the Balancier Convexe S² calibre through different material and aesthetic interpretations.

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Their release marks not an evolution, but a conclusion. In 2026, production of the movement will end permanently. The year 2026 also marks the beginning of a gradual transition toward an almost entirely new collection. 

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As Greubel Forsey closes the chapter on calibres that have shaped the past years of technical and creative development, each will be retired deliberately – not silently – with a final expression that celebrates its contribution to the Atelier’s continuous evolution. 

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Limited to only 11 timepieces per edition, the black ceramic / 5N red gold and white ceramic executions stand as the final and most exclusive expressions of the Balancier Convexe S² – the closing statement of a calibre defined by architecture, chronometric intent and mechanical coherence. 

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TECHNICAL SPECIFICATIONS  

Collection   CONVEXE

Name   Balancier Convexe S² White Ceramic Edition

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Balancier Convexe S2
In white ceramic Limited edition
Hand-wound movement 
• Patented
Hours and minutes • small seconds • power-reserve
• 30° inclined Greubel Forsey balance wheel system

Ref. GF09xv

MOVEMENT
MOVEMENT DIMENSIONS
• Overall diameter: 37.00mm
• Thickness: 10.05mm
NUMBER OF PARTS
• Movement: 301 parts
• Escapement platform: 68 parts
NUMBER OF JEWELS • 43
• Olived-domed jewels in gold chatons
CHRONOMETRIC POWER RESERVE • 72 hours
BARRELS
• Two 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
• Relief-engraved text, circular-grained
BALANCE WHEEL
• In-house variable-inertia with 6 gold mean-time screws (12.60mm diameter)
FREQUENCY • 21’600 vibrations/hour
BALANCE SPRING
• Phillips terminal curve
• Geneva-style stud
BRIDGES AND MAIN PLATES
• Titanium
• Frosted, polished bevelling and countersinks
• Multi-level, openworked suspended-arch bridge, straight-grained
and polished, polished bevelling and countersinks
MOVEMENT SIDE
• Frosted bridges, polished edges and bevelling
• Gold plate with engraved limitation number, circular-grained,
polished bevelling and countersinks, straight-grained flanks
ESCAPEMENT PLATFORM
• Titanium
• Inclined at a 30° angle
• Frosted, polished countersinks, large straight-grained inclined facet
• Multi-level, openworked balance wheel bridge, straight-grained and polished, polished bevelling and countersinks GEARING
• Involute circle profile
• Inclined gear and profiled teeth on intermediate wheels of the set hands mechanism and small seconds
DISPLAYS
• Hours and minutes, on suspended arch bridge
• Small seconds
• Power reserve on a sector

EXTERIOR

CASE
• In white ceramic with curved synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped bezel, hand-finished
• Ceramic profiled lugs, screwed fixing
• Transparent back with high domed synthetic sapphire crystal
• Titanium security screws
• Raised engraving “Balancier Incliné” and “Greubel Forsey”
CASE DIMENSIONS
• Caseband diameter: 41.50mm
• Bezel diameter: 44.00mm
• Case height: 12.85mm
• Height on synthetic sapphire crystals: 14.80mm
WATER RESISTANCE OF THE CASE • Water-resistant 3atm - 30m – 100ft
(standard NIHS 92-20/SN ISO 22810:2010)
CROWN
• Titanium and rubber with GF logo
• Colour-coded rubber capping, interchangeable
DIAL SIDE
• Three-dimensional, variable geometry hour-ring, polished, with engraved and lacquered minute-circle
• Three-dimensional, variable geometry hour indexes, polished, with Super-Luminova
• Power-reserve indicator, lacquered
• Gold small seconds dial, with polished bevel, engraved and lacquered
HANDS
• Hours and minutes, curved profile, polished steel with Super-Luminova
• Small seconds, in polished steel, flat black polished head
• Power-reserve, red triangle
STRAP AND CLASP
• Hand-sewn textured rubber or rubber with text in relief
• Titanium folding clasp, engraved GF logo

• 🔰Limitation 
• Limited Edition of 11 pieces.

🔴 Price  On request💰

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TECHNICAL SPECIFICATIONS  

Collection  CONVEXE 

Name   Balancier Convexe S² Black Ceramic and 5N Red Gold Edition

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Balancier Convexe S2
In ceramic and 5N red gold Limited edition
Hand-wound movement 
• Patented
Hours and minutes • small seconds • power-reserve
• 30° inclined Greubel Forsey balance wheel system

MOVEMENT
MOVEMENT DIMENSIONS
• Overall diameter: 37.00mm
• Thickness: 10.05mm
NUMBER OF PARTS
• Movement: 301 parts
• Escapement platform: 68 parts
NUMBER OF JEWELS • 43
• Olived-domed jewels in gold chatons
CHRONOMETRIC POWER RESERVE • 72 hours
BARRELS
• Two 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
• Relief-engraved text, circular-grained
BALANCE WHEEL
• In-house variable-inertia with 6 gold mean-time screws (12.60mm diameter)
FREQUENCY • 21’600 vibrations/hour
BALANCE SPRING
• Phillips terminal curve
• Geneva-style stud
BRIDGES AND MAIN PLATES
• Titanium
• Frosted, polished bevelling and countersinks
• Multi-level, openworked suspended-arch bridge, straight-grained
and polished, polished bevelling and countersinks
MOVEMENT SIDE
• Frosted bridges, polished edges and bevelling
• Gold plate with engraved limitation number, circular-grained,
polished bevelling and countersinks, straight-grained flanks
ESCAPEMENT PLATFORM
• Titanium
• Inclined at a 30° angle
• Frosted, polished countersinks, large straight-grained inclined facet
• Multi-level, openworked balance wheel bridge, straight-grained and polished, polished bevelling and countersinks GEARING
• Involute circle profile
• Inclined gear and profiled teeth on intermediate wheels of the set hands mechanism and small seconds
DISPLAYS
• Hours and minutes, on suspended arch bridge
• Small seconds
• Power reserve on a sector

EXTERIOR

CASE
• In ceramic and 18k 5N red gold with curved synthetic
sapphire crystal
• Three-dimensional, variable geometry-shaped bezel,
hand-polished with hand-finished straight graining
• Ceramic profiled lugs, screwed fixing
• Transparent back with high domed synthetic sapphire crystal
• Titanium security screws, black treatment
• Raised engraving “Balancier Incliné” and “Greubel Forsey”
CASE DIMENSIONS
• Caseband diameter: 41.50mm
• Bezel diameter: 44.00mm
• Case height: 13.25mm
• Height on synthetic sapphire crystals: 14.80mm
WATER RESISTANCE OF THE CASE • Water-resistant 3atm - 30m – 100ft
(standard NIHS 92-20/SN ISO 22810:2010)
CROWN
• In 18k 5N red gold, titanium and rubber with GF logo
• Colour-coded rubber capping, interchangeable
DIAL SIDE
• Three-dimensional, variable geometry hour-ring, polished, with engraved and lacquered minutes indexes
• Three-dimensional, variable geometry hour indexes, polished, with Super-Luminova
• Power-reserve indicator, engraved and lacquered
• Gold small seconds dial, polished bevel, black treatment
HANDS
• Hours and minutes, curved profile, polished steel with Super-Luminova
• Small seconds, in polished steel, flat black polished head
• Power-reserve, red triangle
STRAP AND CLASP
• Hand-sewn textured rubber or rubber with text in relief
• 18k 5N red gold and titanium folding clasp, engraved GF logo

• 🔰Limitation 
• Limited Edition of 11 pieces.

🔴 Price  On request💰Approximate price: CHF 295,000.  

⚠️☎️For details, please contact me directly at marwa.turki@greubelforsey.com or by mobile at +41 79 468 94 69. Marwa.

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Press Release - 2026
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GREUBEL FORSEY SA
For further information: 
Communication Department 
press@greubelforsey.com – +41 79 194 2884
Eplatures-Grise -16 P.O. Box 670 
2301 La Chaux-de-Fonds - Switzerland
+41 32 925-4545
+41 32 925-4502
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GREUBEL FORSEY – QP Balancier Calendar Gold Edition

GREUBEL FORSEY – QP Balancier Perpetual Calendar White Gold 45.1 mm Limited Edition 2025

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The Perpetual Calendar, Without Compromise 

The new QP Balancier by Greubel Forsey is the purest, most intuitive perpetual calendar ever – uniting 12 functions and indications in a single crown, with no additional pushers, no crown positions to memorise, and no risk at any time. Powered by the patented Mechanical Computer and multiple security systems, it adjusts instantly in either direction, restarts instantly after months unwound, and stays programmed until the year 2100. Featuring our 30° inclined balance wheel, it is limited to 22 timepieces in white gold.

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For centuries, the perpetual calendar has been revered as one of watchmaking’s most prestigious complications. Yet it often came with compromises: fragile mechanisms, cryptic interfaces, and laborious resets whenever the watch stopped.

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Greubel Forsey set out to change that. In 2015, the QP à Équation introduced the Mechanical Computer – our seventh Fundamental Invention – a 25-part mechanical brain that “knows” the Gregorian calendar rules, ensuring perfect synchronisation of every display.

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The new QP Balancier distills this breakthrough into its most refined form. It unites 12 indications – hours, minutes, seconds, power reserve, day, date, month, leap year, day/night, 24-hour display, calendar year, and the patented function selector – all operated by a single crown for effortless time and calendar setting. The result is the only perpetual calendar that requires no handbook to operate.

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Hidden pushers? Multiple crown positions? Forward-only adjustment? Lengthy resets? Every limitation of traditional perpetual calendars has been eliminated. The QP Balancier turns freely in both directions at any time of day, corrects instantly even after months unwound, and locks safely during the vulnerable midnight changeover, with a visible red zone for extra security. Programmed correctly until February 28, 2100, it needs only a simple Atelier adjustment to remain accurate for another century.

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Aesthetically, the QP Balancier embodies purity. Its multi-level gold dial presents day, large date, and month in a single intuitive line, flanked by leap year and day/night indicators. Every element is reduced to the essentials for instant legibility and visual harmony.

The experience goes beyond sight: the quick-correction mode transforms date-setting into a tactile pleasure, each crisp jump through the crown letting the wearer feel the mechanism come alive – a moment of connection between human and machine.

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The 45.1 mm white gold case, just 14.75 mm high, houses the 12.6 mm balance wheel inclined at 30°, a high-mass, variable-inertia balance with gold mean-time screws for superior chronometric performance.

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Each of its 612 components is hand-finished to the Atelier’s uncompromising standards – bevelled, black-polished, frosted, or straight-grained – with twin fast-rotating barrels delivering a 72-hour chronometric power reserve.

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Limited to 22 timepieces in white gold, the QP Balancier is the most practical, reliable, and user-friendly perpetual calendar ever created – without a single compromise in chronometry, craftsmanship, or beauty.

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TECHNICAL SPECIFICATIONS  

Collection  QP Balancier 

Name   Greubel Forsey QP Balancier in White Gold

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QP Balancier
In white gold
Limited edition
Hand-wound movement with 2 patents

• Bidirectional perpetual calendar 
• day, date, month, calendar year, leap year, day-and-night
• function selector 
• 30° inclined Greubel Forsey balance wheel system
• hours and minutes • small seconds • power-reserve

 

 CASE
    Material: 18-carat white gold with high domed synthetic sapphire crystal
    Diameter: 44.70mm
    Bezel diameter: 45.10mm
    Height: 10.55mm
    Height on synthetic sapphire crystals: 14.75mm
    Crown in white gold with engraved GF logo
    Transparent back with high domed synthetic sapphire crystal
    Hand-polished bezel, caseband with hand-finished straight graining
    Gold security screws
    Raised polished engraving “QP Balancier” and “Greubel Forsey” on a hand-punched background
    Water-resistant to 3atm - 30m - 100ft
DIAL
    Multi-level in gold, anthracite colour
    Gold perpetual calendar aperture with polished raised engraving
    Leap year, day-and-night, small second, power-reserve and function selector indicators in gold, circular-grained, straight-grained flanks with polished bevel
Hands
    Hours and minutes in polished steel, with Super-LumiNova
    Power-reserve and leap year in polished steel, hand-polished countersink, flat black polished head 
DISPLAYS
Hours and minutes
Small seconds on disc
72-hours power reserve on a sector
Day of the week, large date and month
Leap year
Day-and-night on disc (with red safety zone)
Function selection (QP calendar or HM time adjustment)
Calendar year (Back display)
MOVEMENT
    Hand-wound movement with 2 patents
    Diameter: 40.80mm
    Thickness: 10.40mm
    Movement parts: 612
    Escapement platform: 59 parts
    Number of jewels: 78
    Olived-domed jewels in gold chatons
    Two 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
    Balance wheel: In-house variable-inertia with 6 gold mean-time screws (12.60mm diameter)
    Frequency: 21'600 vph, 3 Hz
    Power reserve of 72 hours
Functions
    Hours and minutes
    Small seconds on disc
    72-hours power reserve on a sector
    Day of the week, large date and month
    Leap year
    Day-and-night on disc (with red safety zone)
    Function selection (QP calendar or HM time adjustment)
    Calendar year (Back display)
STRAP and CLASP
    Hand-sewn textured rubber
    White gold folding clasp, hand-engraved with the GF logo

•  🔰Limitation 
• Limited Editionof 22 pieces.

🔴 Price  On request💰first pieces will be delivered this year. 

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Press Release - 2025
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GREUBEL FORSEY SA
For further information: 
Communication Department 
press@greubelforsey.com – +41 79 194 2884
Eplatures-Grise -16 P.O. Box 670 
2301 La Chaux-de-Fonds - Switzerland
+41 32 925-4545
+41 32 925-4502
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GREUBEL FORSEY – Nano Foudroyante Tourbillon Chronograph White Gold Edition

GREUBEL FORSEY – Nano Foudroyante Tourbillon Chronograph White Gold 37,9 mm Limited Edition 2025

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WE ARE BACK WITH A PARADIGM-SHIFTING CREATION.

Greubel Forsey unveils the first official limited edition of its Nano Foudroyante: a breakthrough timepiece born from years of research, now matured beyond its Experimental Watch Technology (EWT) origins.

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Limited to just 22 timepieces, this creation marks a significant new chapter in Greubel Forsey's 10th Fundamental Invention.

FROM PROTOTYPE TO TIMEPIECE

Originally presented in 2024 as a commemorative EWT edition, the Nano Foudroyante was Greubel Forsey’s most technically radical concept to date. Today, it has evolved into a fully realized and independent creation – no longer tethered to an anniversary or prototype designation.

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The new Nano Foudroyante is crafted entirely in white gold, replacing the original combination of white gold and tantalum. It presents a different architectural identity: the gold dial is now finished in rhodium with a blue minute track, while the hands are rendered in blued steel with matching cannon pinions. 

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The foudroyante dial itself is now white with transferred numerals, enhancing legibility and echoing the crisp visual language of the tourbillon aperture. A blue textured rubber strap completes the aesthetic – a clear evolution from the original edition, and a declaration of this timepiece’s own distinct personality.

NANOMECHANICS: REINVENTING THE POSSIBLE

At the heart of this timepiece lies a disruptive idea: nanomechanics – the control of energy at the nanojoule scale inside a mechanical movement. This paradigm shift enables the Nano Foudroyante to operate its eponymous complication using just 16 nanojoules per jump, compared to 30 microjoules in traditional designs – a staggering reduction by a factor of 1,800.

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The complication divides each second into six segments using a lightweight, red-treated hand that rotates once per second, driven directly by the oscillations of the 3Hz balance wheel. There is no traditional gear train; instead, a minimalist series of low-inertia wheels efficiently distributes energy through the movement.

A COMPACT AND REFINED ARCHITECTURE

The Nano Foudroyante mechanism is embedded within Greubel Forsey’s first flying tourbillon, creating a visual and technical centerpiece. The foudroyante’s dial remains permanently oriented to twelve o’clock, even as the tourbillon rotates – ensuring optimal readability.

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The timepiece features a hand-wound flyback with 2 patents, totaling 428 components (including 142 for the tourbillon cage). Despite this complexity, the movement measures just 31.60mm in diameter and fits within a 37.90mm white gold case – Greubel Forsey’s most compact ever.

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The case is fitted with a high-domed sapphire crystal, straight-grained finishing on the caseband, and a transparent caseback. Subtle engravings – “Nano Foudroyante” and “Greubel Forsey” – stand out in polished relief over a hand-hammered background.

A NEW CHAPTER, FULLY REALISED

This timepiece embodies maturity and intent, created for 22 collectors who will experience Greubel Forsey’s most energy-efficient, compact, and conceptually advanced timepiece to date.

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 TECHNICAL DETAILS  

 Model:  Nano Foudroyante Tourbillon Chronograph White Gold

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Nano Foudroyante
In white gold
Limited Edition
Hand-wound chronograph movement with 2 patents

• Flying tourbillon with Nano Foudroyante • hours and minutes • small seconds
• 60-second tourbillon rotation • chronograph seconds (trotteuse)
• 60-minute counter • flyback function  

MOVEMENT

MOVEMENT DIMENSIONS
• Diameter: 31.60mm
• Thickness: 9.40mm
NUMBER OF PARTS
• Movement: 428 parts
• Tourbillon cage: 142 parts
• Weight of the cage: 0.835g
NUMBER OF JEWELS • 53
• Olived-domed jewels in gold chatons
CHRONOMETRIC POWER RESERVE
• One full day, with chronograph engaged
BARRELS
• Fast rotating barrel (1 turn in 3.7 hours) with a fixed main spring bridle
BALANCE WHEEL
• Variable-inertia with gold mean-time screws (10mm diameter)
FREQUENCY • 21’600 vibrations/hour
BALANCE SPRING
• Phillips terminal curve
• Geneva-style stud
BRIDGES AND MAIN PLATES
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Straight-grained and flat black polished steel chronograph mechanism, polished bevelling, straight-grained flanks
• Three-dimensional column wheel, frosted and circular-grained, polished columns
• Central seconds wheel, circular-grained, polished bevelling with relief-engraved texts
• Gold plate, circular-grained, with engraved limitation number
TOURBILLON
• Flying Tourbillon with embedded Nano Foudroyante mechanism
• Foudroyante dial, constant vertical indication
• Titanium cage bridges, polished bevelling, straight-grained flanks, with engraved GF logo
• Platinum counterweight
GEARING
• Involute circle profile
• Micro-module with reduced play
DISPLAYS
• Hours and minutes
• Small seconds
• 60-second tourbillon rotation
• Foudroyante, sixth of a second
CHRONOGRAPH
• 60-second flange
• 60-minute counter, semi-instantaneous

EXTERIOR 

CASE

• In white gold with high domed synthetic sapphire crystal
• Hand-polished bezel, caseband with hand-finished straight-graining
• Transparent back with high domed synthetic sapphire crystal
• Raised polished engraving “Nano Foudroyante” and “Greubel Forsey” on a hand-punched background
• Gold security screws
DIMENSIONS
• Caseband diameter: 37.90mm
• Bezel diameter: 38.30mm
• Case height: 10.49mm
• Height on synthetic sapphire crystals: 14.34mm
WATER RESISTANCE OF THE CASE • Water-resistant 3atm - 30m - 100ft
(standard NIHS 92-20/SN ISO 22810:2010)
CROWN AND PUSHERS
• Crown with pusher, in white gold, engraved GF logo
• Pusher in white gold, hand-polished

DIAL

• Multi-level in gold, rhodium-coloured, minute-circle with blue finish,
small seconds and chronograph minutes counter with polished bevel,
engraved and lacquered indications, with a visual opening for the tourbillon
• Foudroyante in light alloy, polished bevel with flat black polished central plate.
HANDS
• Hours and minutes in polished blued steel with Super-LumiNova, hand-polished countersink, flat black polished head
• Small seconds and chronograph hands in polished blued steel, hand-polished countersink, flat black polished head
• Tourbillon and Foudroyante in light alloy, red treatment

STRAP AND CLASP

• Hand-sewn textured rubber
• White gold pin buckle, hand-engraved GF logo

🔰 Limitation 
Limited Edition ✅ Only ❱❱❱ 22 pieces.

🔴 Price  CHF 465'000 (excl. taxes)💰

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Press Release - 2025
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-------------------------------------------------
GREUBEL FORSEY SA
For further information: 
Communication Department 
press@greubelforsey.com – +41 79 194 2884
Eplatures-Grise -16 P.O. Box 670 
2301 La Chaux-de-Fonds - Switzerland
+41 32 925-4545
+41 32 925-4502
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www.GreubelForsey.com