GREUBEL FORSEY – Nano Foudroyante EWT Edition

GREUBEL FORSEY – Nano Foudroyante EWT Tourbillon Tantalum / White Gold 37,9 mm 20th Anniversary Limited Edition 2024

 GREUBEL FORSEY UNVEILS ITS 10TH FUNDAMENTAL INVENTION

To celebrate the 20th anniversary (2004-2024), Greubel Forsey presents its 10th Fundamental Invention: the Nano Foudroyante EWT. The mechanism’s energy is managed at the nanojoule scale, significantly reducing the number of components and the overall dimensions. 

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The result is a 37.9 mm timepiece that combines the world’s first perpetual Nano Foudroyante with Greubel Forsey’s first flying tourbillon and manual wind flyback. This timepiece, set in a white gold and tantalum case, will be limited to just 11 pieces.

LEGACY OF INNOVATION

The first Fundamental Invention by Robert Greubel and Stephen Forsey was launched in 2004, marking the Atelier’s commitment to research and invention. For over 20 years, this focus has been at the heart of all Greubel Forsey’s Fundamental Inventions and timepieces. Today, Greubel Forsey’s research is even more fundamental, aiming to completely rethink the approach to the conception of a timepiece. This endeavor demonstrates a major technological leap, comparable to the transition from tower clocks to wristwatches.

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Originally, horological instruments were large and public. Over time, they became transportable (table clocks, marine chronometers), then portable with pocket watches, and finally wearable with wristwatches. This evolution reaches its peak today with nanomechanics — a revolution Greubel Forsey is pioneering. 

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Thus, Greubel Forsey introduces its 10th invention: the Nano Foudroyante. This new Fundamental Invention is the most technologically disruptive — not only for Greubel Forsey but also for the universe of mechanical watchmaking.

NANOMECHANICS: A NEW HORIZON

What is nanomechanics? It is a realm beyond the miniaturization of components to the nanometric scale. When we talk about nanomechanics, we’re talking about controlling energy on a nanojoule scale within a mechanical movement. 

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This revolution in energy management within a caliber allows for a drastic reduction in both energy consumption and the number of components.

A REVOLUTIONIZED MECHANISM

To demonstrate the feasibility of nanomechanics, Greubel Forsey has reinvented the foudroyante second. Its hand completes one revolution per second, dividing it into segments according to the movement’s frequency. In this Nano Foudroyante, each oscillation of the 3 Hz balance wheel produces two beats, totaling six beats per second, allowing the hand to divide the second into six distinct segments. This is an energy-intensive complication by nature. 

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However, by managing energy on a nanojoule scale, Greubel Forsey has radically rethought its design and construction. Compared to a traditional foudroyante that consumes 30 μJ (microjoules) per jump, the Nano Foudroyante operates with only 16 nJ (nanojoules) per jump, reducing energy consumption by a factor of 1,800. 

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The mechanism’s volume is therefore reduced by 90%. Here, the focus is not just on measuring fractions of a second but as a proof of concept for a completely new approach to watchmaking, which is why this Nano Foudroyante was chosen to be a perpetual display.

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It eliminates the entire gear train required in a traditional foudroyante to divide the second, as the information is sourced directly, distributing and managing the energy from the movement through a minimal number of low-inertia wheels. 

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Fewer components mean less volume: this Nano Foudroyante EWT is very compact, with 428 components, and the movement measures no more than 31 mm in diameter within a 37.9 mm case (the smallest ever built by Greubel Forsey).

HOROLOGY AT ITS PEAK

There’s more: true to Greubel Forsey’s passion for the tourbillon, this Nano Foudroyante is integrated within a flying tourbillon — the first ever made by Greubel Forsey. Finally, an additional innovation: although this flying tourbillon rotates constantly, the Nano Foudroyante’s dial remains permanently aligned towards twelve o’clock for optimal readability.

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Together with the flyback, these three features complete Greubel Forsey's 10th Fundamental Invention: a Nano Foudroyante, set within a flying tourbillon, with an oriented reading axis.

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This is just the foundation and not the end result: this 10th Invention is powered by a manual-winding flyback movement. This complication presented by Greubel Forsey, includes column-wheel control within the strong architectural design and exceptional finishing, a signature of Greubel Forsey.

A LIMITED EDITION MASTERPIECE

The timepiece will be made in a limited edition of just 11 pieces in this inaugural, refined version, emphasizing its disruptive technical character and highlighting the personality of a timepiece brilliantly conceived in the EWT (Experimental Watch Technology) laboratory.

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The white gold case offers an additional surprise, with a bezel and back crafted from tantalum — a first for Greubel Forsey, who have never used this material before. Known for its gray-blue sheen and complexity in machining and finishing (with a melting point above 3000°C), tantalum requires rare expertise. 

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The Atelier also preserves its essential aesthetic signatures, including polished relief engravings of “Nano Foudroyante” and “Greubel Forsey” on a hand-hammered background, hand-satin-finished white gold, and a highly architectural movement. This masterpiece displays the movement around its column wheel with rare 3D monobloc geometry, visible through the back. 

The timepiece is engraved with “2004 – 2024” and “20th Anniversary” to mark this milestone.

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 TECHNICAL DETAILS 

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Nano Foudroyante EWT
In white gold and tantalum
Hand-wound movement with 2 patents

MOVEMENT

NUMBER OF PARTS
• Movement: 428 parts
• Tourbillon cage: 142 parts
NUMBER OF JEWELS
• 42
• Olived-domed jewels in gold chatons
CHRONOMETRIC POWER RESERVE
• One full day, with chronograph engaged
FREQUENCY • 21’600 vibrations/hour
TOURBILLON
• Flying Tourbillon with embedded Nano Foudroyante mechanism
• Foudroyante dial, constant vertical indication
• Titanium cage bridges, circlar-grained, polished bevelling, straight-grained flands with engraved GF logo
• Platinum counterweight

EXTERIOR 

CASE
• Tantalum and white gold with high domed synthetic sapphire crystal
• Tantalum hand-polished bezel, transparent tantalum back
• White gold caseband with hand-finished straight-graining
CASE DIMENSIONS
• Diameter: 37,90mm
• Height: 10,49mm
WATER RESISTANCE OF THE CASE
• Water-resistant 3atm - 30m - 100ft (standard NIHS 92-20/SN ISO 22810:2010)
DIAL SIDE
• Multi-level in gold, rhodium-coloured, engraved and black lacquered hour-ring and minute-circle with a visual opening for the tourbillon
• Small seconds and chronograph minutes counter in gold, polished bevel
• Foudroyante, frosted, fractions of seconds engraved and black lacquered
STRAP AND CLASP
• Non-animal material, hand-sewn
• White gold pin buckle, hand-engraved GF logo

🔰 Limitation 
Limited Edition ✅ Only ❱❱❱ 11 pieces.

🔴 Price on Request 💰

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Press Release - 2024
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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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