Greubel Forsey Unveils Final Editions Of The Balancier Convexe S²
Greubel Forsey has announced the final two editions of the Balancier Convexe S², marking the end of a calibre developed and refined over the past five years.
The closing models come in two distinct versions: one in black ceramic with 5N red gold accents, and the other in white ceramic. Each is limited to just 11 pieces, making them the most exclusive interpretations of the series.
Both watches feature the brand’s signature Convexe case (41.5mm) and are powered by a hand-wound movement with a 30° inclined balance wheel system. With these releases, the Balancier Convexe S² enters its final chapter, with production set to end permanently in 2026.
A Fully Integrated Architecture
From the outset, the Balancier Convexe S² was conceived as a fully integrated design, where case geometry and movement architecture evolve together. The Convexe case follows the natural curve of the wrist, ensuring balance, legibility, and comfort.
Rather than simply housing the movement, the case extends its architecture outward—creating a seamless dialogue between exterior form and mechanical construction.
The 30° Inclined Balance Wheel
At the heart of the movement is Greubel Forsey’s signature 30° inclined balance wheel, serving as both a visual and chronometric focal point.
The calibre is openworked and multi-layered, with bridges and suspended structures that reveal the mechanics. It comprises 301 components, including a 68-part escapement platform. Two fast-rotating coaxial barrels provide a 72-hour power reserve, while a variable-inertia balance with six gold screws operates at 21,600 vibrations per hour.
Finishing as a Philosophy
Finishing remains central to the watch’s identity. Titanium bridges and plates are frosted and hand-finished with polished bevels and precise transitions.
Even the least visible components receive meticulous attention—reflecting the brand’s philosophy that craftsmanship extends beyond what the eye can see.
Two Distinct Final Expressions
While mechanically identical, the two editions present contrasting aesthetics—one bold and warm with black ceramic and red gold, the other clean and monochromatic in white ceramic.
Both retain the defining layout: hours and minutes on a suspended arch bridge, small seconds, and a sector power-reserve indicator. Curved sapphire crystals, sculpted lugs, and a three-dimensional bezel further emphasize the harmony between movement and case.
A Chapter Concludes
These final editions bring a five-year exploration of the Balancier Convexe S² to a definitive close. Production of the movement will end in 2026, alongside a broader transition toward a new generation of timepieces from the Atelier.
Limited to just 11 pieces per version, these watches stand as the ultimate expression of the Balancier Convexe S²—defined by architectural design, chronometric ambition, and mechanical integrity.
Technical Specifications:
Balancier Convexe S2
In ceramic and 5N red gold
Limited edition
Hand-wound movement • Patents pending
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, black treatment
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, black treatment
• Multi-level, openworked suspended-arch bridge, black treatment, straight-grained and polished, polished bevelling and countersinks
MOVEMENT SIDE
• Frosted bridges, black treatment, polished edges and countersinks
• 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, grey treatment
• Multi-level, openworked balance wheel bridge, black treatment, 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
For more information please visit Greubel Forsey