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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