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Greubel Forsey introduces the final and most exclusive editions of the Balancier Convexe S²: one in black ceramic with 5N red gold, and one in white ceramic, each strictly limited to 11 pieces.
These editions conclude a calibre developed through five years of mechanical and architectural exploration, with production set to cease permanently in 2026.
The Convexe case (41.5 mm) and movement were conceived as a single architectural whole, integrating Greubel Forsey’s signature 30° inclined balance wheel system as the visual and chronometric centre. The openworked movement features 301 components, including a 68‑part escapement platform, and is powered by two rapid-rotation coaxial barrels delivering a 72‑hour chronometric reserve.
Finishing remains uncompromising: frosted titanium bridges, polished bevels, hand‑finished countersinks, and meticulous transitions — even on invisible components.
Two Final Interpretations
Black Ceramic & 5N Red Gold
A dramatic contrast of dark architecture framed by ceramic, with red gold adding warmth and sculptural depth.The interplay of matte and polished surfaces enhances the piece’s three‑dimensional form
White Ceramic
A purist, graphic expression that highlights the structural geometry of the movement through light and shadow.The monochromatic case offers clarity, openness and a distinctly technical aesthetic.
Both editions preserve the characteristic S² display: suspended hours/minutes bridge, small seconds, and sector power‑reserve indication beneath a curved sapphire crystal.
This launch marks the concluding chapter of the Balancier Convexe S²’s five‑year evolution — not an iteration, but a final statement. As of 2026, Greubel Forsey will begin a gradual shift toward an almost entirely new collection, retiring earlier calibres with intention and ceremony rather than quiet discontinuation.

| Dimensions | Overall diameter: 37.00 mm Thickness: 10.05 mm |
|---|---|
| Number of Parts | Movement: 301 Escapement platform: 68 |
| Jewels | 43; olived‑domed jewels set in gold chatons |
| Chronometric Power Reserve | 72 hours |
| Barrels | Two coaxial, series‑coupled fast‑rotating barrels (1 turn in 3.2 hours); one barrel with slipping spring to avoid excess tension; relief‑engraved text, circular‑grained |
| Balance Wheel | In‑house variable‑inertia with 6 gold mean‑time screws (12.60 mm 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, with polished bevelling and countersinks |
| Movement Side | Frosted bridges with polished edges and bevelling; gold plate with engraved limitation number, circular‑grained with polished bevelling and countersinks, straight‑grained flanks |
| Escapement Platform | Titanium; inclined at 30°; frosted with polished countersinks and a large straight‑grained inclined facet; multi‑level openworked balance wheel bridge, straight‑grained and polished with 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 |
| Case | White ceramic with curved synthetic sapphire crystal; three‑dimensional variable‑geometry bezel, hand‑finished; ceramic profiled lugs with screwed fixing; transparent back with high domed sapphire; titanium security screws; raised “Balancier Incliné” and “Greubel Forsey” engraving |
|---|---|
| Case Dimensions | Caseband diameter: 41.50 mm; Bezel diameter: 44.00 mm; Case height: 12.85 mm; Height on sapphire crystals: 14.80 mm |
| Water Resistance | 3 atm / 30 m / 100 ft (NIHS 92‑20 / ISO 22810:2010) |
| Crown | Titanium and rubber with GF logo; interchangeable colour‑coded rubber capping |
| Dial | 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/minutes: curved profile, polished steel with Super‑Luminova; small seconds: 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 |

| Dimensions | Overall diameter: 37.00 mm Thickness: 10.05 mm |
|---|---|
| Number of Parts | Movement: 301 Escapement platform: 68 |
| Jewels | 43; olived‑domed jewels set in gold chatons |
| Chronometric Power Reserve | 72 hours |
| Barrels | Two coaxial, series‑coupled fast‑rotating barrels (1 turn in 3.2 hours); one barrel with 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 (12.60 mm diameter) |
| Frequency | 21,600 vibrations/hour |
| Balance Spring | Phillips terminal curve; Geneva‑style stud |
| Bridges and Main Plates | Titanium; frosted with polished bevelling and countersinks, black treatment; multi‑level openworked suspended‑arch bridge, black treatment, straight‑grained and polished with polished bevelling and countersinks |
| Movement Side | Frosted bridges with black treatment, polished edges and countersinks; gold plate with engraved limitation number, circular‑grained with polished bevelling and countersinks, straight‑grained flanks |
| Escapement Platform | Titanium; inclined at 30°; frosted with polished countersinks and large straight‑grained inclined facet, grey treatment; multi‑level openworked balance wheel bridge, black treatment, straight‑grained and polished with 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 |
| Case | Ceramic and 18k 5N red gold with curved synthetic sapphire crystal; three‑dimensional variable‑geometry bezel (hand‑polished with hand‑finished straight graining); ceramic profiled lugs with screwed fixing; transparent back with high domed sapphire; titanium security screws (black treatment); raised “Balancier Incliné” and “Greubel Forsey” engraving |
|---|---|
| Case Dimensions | Caseband diameter: 41.50 mm; Bezel diameter: 44.00 mm; Case height: 13.25 mm; Height on sapphire crystals: 14.80 mm |
| Water Resistance | 3 atm / 30 m / 100 ft (NIHS 92‑20 / ISO 22810:2010) |
| Crown | 18k 5N red gold, titanium and rubber with GF logo; interchangeable colour‑coded rubber capping |
| Dial | 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 with polished bevel, black treatment |
| Hands | Hours/minutes: curved profile, polished steel with Super‑Luminova; small seconds: 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 |