Greubel Forsey has revealed the final two editions of the Balancier Convexe S², bringing to a close a calibre developed and refined over the past five years.
The concluding models arrive in two distinct executions: one crafted in black ceramic with 5N red gold accents, the other in white ceramic. Each version is limited to just 11 timepieces, making them the most exclusive interpretations of the series.
Both watches are housed in the brand’s signature Convexe case, measuring 41.5mm across the caseband, and are built around Greubel Forsey’s hand-wound movement featuring a 30° inclined balance wheel system. With the launch of these two final references, the Balancier Convexe S² calibre enters its last phase, with production set to end permanently in 2026.
A Fully Integrated Architecture
From its inception, the Balancier Convexe S² was conceived as a fully integrated design, where case geometry and movement architecture evolve in harmony. The Convexe case follows the natural curvature of the wrist, allowing the three-dimensional movement to remain balanced, legible and comfortable in everyday wear.
Rather than simply enclosing the calibre, the case extends the architecture of the movement outward, reinforcing the dialogue between exterior form and mechanical construction.
The 30° Inclined Balance Wheel
At the centre of the movement sits Greubel Forsey’s distinctive 30° inclined balance wheel system, positioned as both the visual and chronometric focal point of the watch. The movement is designed with openness and depth, featuring multi-level bridges and suspended structures that reveal, rather than conceal, the mechanics at work.
Comprising 301 components, including an escapement platform formed of 68 parts, the calibre balances structural lightness with considerable technical complexity. Two fast-rotating coaxial barrels deliver a 72-hour chronometric power reserve, while an in-house variable-inertia balance with six gold mean-time screws operates at 21,600 vibrations per hour.
Finishing as a Philosophy
Finishing remains central to the identity of the timepiece. Titanium bridges and main plates are frosted and meticulously hand-finished with polished bevels, countersinks and carefully executed transitions between surfaces.
Every component receives the same level of attention, including areas rarely seen, reflecting Greubel Forsey’s philosophy that integrity of construction is as important as visual impact.
Two Distinct Final Expressions
While sharing the same mechanical foundation, the two final editions present contrasting visual identities.
The black ceramic and 5N red gold model emphasises contrast and depth. Black-treated movement components and the ceramic case frame the architecture, while the red gold bezel and caseback introduce warmth and visual weight. The interplay of matte and polished surfaces enhances the three-dimensional character of the movement and underscores the sculptural nature of the Convexe case.
In contrast, the white ceramic edition adopts a lighter, more technical aesthetic. Its monochromatic case emphasises clarity and precision, allowing the movement to emerge through subtle shifts of light and shadow. The result is a graphic expression in which structure becomes the dominant visual language, highlighting the purity of the Convexe geometry.
A Chapter Concludes
Both editions retain the functional layout that defines the Balancier Convexe S²: hours and minutes displayed on a suspended arch bridge, a small seconds display, and a sector power-reserve indicator.
Curved sapphire crystals, a three-dimensional bezel geometry and profiled lugs further reinforce the seamless relationship between movement architecture and exterior form.
These two final models conclude a five-year exploration of the Balancier Convexe S² through a series of material and aesthetic interpretations. Their release marks not an evolution, but a definitive conclusion.
In 2026, production of the movement will end permanently. The year will also mark the beginning of a gradual transition towards an almost entirely new collection. As Greubel Forsey closes the chapter on several calibres that have defined its recent technical and creative development, each will be retired deliberately, with a final expression celebrating its contribution to the Atelier’s evolution.
Limited to only 11 pieces per edition, the black ceramic with 5N red gold and the white ceramic versions stand as the final and most exclusive expressions of the Balancier Convexe S² — the closing statement of a calibre defined by architecture, chronometric ambition and mechanical coherence.
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