rom its origin, the Balancier Convexe S² was designed as a fully integrated object in which case geometry and movement structure evolve together. The Convexe architecture follows the natural curvature of the wrist, allowing the three-dimensional movement to remain balanced, legible and comfortable in daily wear. Rather than enclosing the calibre, the case extends its architecture outward, reinforcing the dialogue between exterior form and mechanical construction.

At the heart of the movement lies Greubel Forsey’s 30° inclined balance wheel system, positioned as the visual and chronometric centre of the composition. The movement is built around openness and perspective, with multi-level bridges and suspended structures designed to reveal rather than conceal mechanical function. Composed of 301 components, with an escapement platform of 68 parts, the calibre combines structural lightness with technical density. Two fast-rotating coaxial barrels provide a 72-hour chronometric power reserve, while the in-house variable-inertia balance with six gold mean-time screws operates at 21’600 vibrations per hour.

The finishing philosophy remains fundamental to the identity of the timepiece. Titanium bridges and main plates are frosted and hand-finished with polished bevels, countersinks and carefully executed transitions between surfaces. Every component is treated with the same level of attention, including areas that remain largely unseen, reflecting a consistent approach to execution where integrity of construction prevails over visibility. The two final editions express contrasting visual identities while sharing the same mechanical foundation.

The black ceramic and 5N red gold edition 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 between matte and polished surfaces amplifies the three-dimensional character of the movement and reinforces the sculptural nature of the Convexe case.

The white ceramic edition explores the opposite approach. The monochromatic light-toned case accentuates openness and precision, allowing the movement to emerge through light and shadow. The result is a more technical and graphic expression, where structure becomes the primary visual language. The white ceramic construction highlights the purity of the Convexe geometry while preserving the same mechanical depth and legibility.

Both editions retain the essential functional layout of the Balancier Convexe S²: hours and minutes displayed on a suspended arch bridge, small seconds, and a sector power-reserve indication. The curved sapphire crystals, three-dimensional bezel geometry and profiled lugs reinforce the continuity between movement architecture and exterior form, maintaining the balance between presence and wearability that defines the Convexe approach. These two editions complete a five-year exploration of the Balancier Convexe S² calibre through different material and aesthetic interpretations. Their release marks not an evolution, but a conclusion. In 2026, production of the movement will end permanently.

The year 2026 also marks the beginning of a gradual transition toward an almost entirely new collection. As Greubel Forsey closes the chapter on calibres that have shaped the past years of technical and creative development, each will be retired deliberately – not silently – with a final expression that celebrates its contribution to the Atelier’s continuous evolution.

Limited to only 11 timepieces per edition, the black ceramic / 5N red gold and white ceramic executions stand as the final and most exclusive expressions of the Balancier Convexe S² – the closing statement of a calibre defined by architecture, chronometric intent and mechanical coherence.