Greubel Forsey Balancier Convexe S² Black Ceramic and Red Gold, Ref. P01233

The Greubel Forsey Balancier Convexe S² in black ceramic and 18K 5N red gold is one of the two final editions of the model, released in 2026 and limited to 11 pieces. Production of the Balancier Convexe S² calibre ends permanently in 2026, making this one of the last examples ever made. Its signature feature is a balance wheel inclined at 30 degrees, which helps keep timekeeping consistent in different wrist positions, displayed in an open, layered dial with a small seconds and a sector power reserve indicator. The convex case measures 41.5 mm across the caseband, framed by a red gold bezel and matching caseback set against black ceramic. It is powered by the hand-wound Calibre GF09xv, with twin fast-rotating barrels delivering a 72-hour power reserve, visible through the sapphire caseback. It comes on a black textured rubber strap with a titanium and red gold folding clasp. This example is brand new and comes as a full set with box and papers, available on request from SRK Haute Horlogerie.