Spacegraf Heure Sidérale Tourbillon Volant Millésime 2026

The Architect

ExpertOct 22, 2026

77

The Spacegraf Heure Sidérale Tourbillon Volant Millésime 2026 represents a consequential departure from Yema's mid-century pilot and dive heritage — a brand historically defined by accessible French horological pragmatism, now positioning itself within complications of considerably greater technical ambition. The flying tourbillon, vis-à-vis a conventional caged iteration, eliminates the upper bridge, producing the visual openness that the sidereal time complication demands as a presentational context. Concordantly, the manual caliber CMM.32 achieves a 105-hour power reserve — a figure that, within the class of tourbillon movements at this price stratum, represents a defensible engineering outcome. The titanium case at 42mm and 12.15mm depth demonstrates geometric discipline: the probability of this proportion overwhelming the wrist falls low for most contemporary wearers. As you undoubtedly gather, the leather strap is the axis of least resolution here — a titanium pin buckle paired with leather at $15,225 USD suggests an economy of finishing misaligned with the complication above it. The value equation is nuanced. There exists a certainty that no established maison produces a flying tourbillon with sidereal indication at this price point; Yema's predecessors in French independent watchmaking rarely ventured this far into haute complication. The inevitability, ergo, is that this reference will be evaluated not against Yema's own lineage, but against the broader landscape of accessible tourbillon propositions — a comparison it largely survives.