PATEK'S NEW CUBITUS PERPETUAL CALENDAR IS 5MM THIN AND HAS 313 PARTS

Less than two years after its high-profile debut, Patek Philippe's Cubitus collection welcomed its most complicated version yet at Watches and Wonders Geneva: the Cubitus Perpetual Calendar, reference 5840P-001, built around an entirely new in-house movement, Caliber 28-28 Q SQU, developed specifically for the collection's distinctive square case dimensions.

The technical achievement is genuinely notable: despite containing 313 parts and displaying a full set of perpetual calendar indications, the movement achieves a thinness of just 5.04mm, thanks in part to a skeletonised mainplate and a gold, rhodium-plated micro-rotor adorned with Patek's Calatrava cross emblem. The case itself, an angular evolution of the octagonal Nautilus case that preceded the Cubitus line, measures just 10mm thick and 45mm wide - slender proportions for a watch carrying this level of mechanical complexity.

The sunburst blue dial continues the openworked motif established by the movement underneath, its familiar horizontal line pattern offering visible glimpses of the mechanism through white gold indexes and baton hands - a design choice that treats the movement's engineering as a visible feature of the watch's aesthetic identity, rather than hiding technical achievement behind a fully closed dial.

For a collection still finding its footing barely two years into its existence, jumping directly into perpetual calendar territory with a genuinely new in-house movement signals real institutional confidence in the Cubitus as a long-term pillar of Patek's catalogue, rather than a passing design experiment.