Patek Philippe's Cubitus collection, initially launched in October 2024, made a notable entry with its distinctive case shape. While the initial models drew comparisons to the celebrated Nautilus due to their square bezels with rounded edges and integrated bracelets, the new Cubitus Perpetual Calendar Skeleton Ref. 5840P-001, unveiled at Watches and Wonders 2026, marks a significant departure. This new complicated timepiece boasts a unique open-worked dial, reminiscent of horizontal blinds, and houses a purpose-built, shaped, and skeletonized caliber 28-28 Q SQU movement, signaling a bold new direction for the luxury watchmaker. It’s a watch that aims to move beyond the shadow of its more famous predecessor, offering a fresh interpretation of Patek Philippe's sophisticated engineering and design.

Patek Philippe's Cubitus Perpetual Calendar Skeleton: A Detailed Look

The journey of the Cubitus collection began with simpler time-and-date models, followed by precious-metal iterations in 2025. Now, the 5840P-001 elevates the collection with its first grand complication. Priced at €176,700 / US$187,547 / CHF 150,000, this platinum timepiece (distinguished by a baguette-cut diamond at 6 o'clock) showcases a 45mm wide and exceptionally slender 10mm thick case. Its two-part construction with lateral lugs, paired with alternating polished and satin-brushed surfaces, offers a compelling visual structure. Though its size might be imposing for smaller wrists, its svelte profile ensures a comfortable fit for those with larger dimensions, exuding a tangible sense of luxury.

The watch's striking blue dial features a horizontally open-worked design, created using laser-cut strips with a blue PVD finish and horizontal brushing. This intricate motif provides a captivating backdrop for the white-gold hour markers and luminous baton hands, enhancing readability despite the complexity. The perpetual calendar functions—day, date, month, leap year, and moon phases—are elegantly displayed with slender white-gold hands. A prominent single moon-phase display, a feature previously seen in limited editions, takes center stage, adding depth and drawing the eye without overcrowding the intricate dial.

At the heart of the 5840P-001 lies the new caliber 28-28 Q SQU. This meticulously crafted, square, and skeletonized perpetual calendar movement was specifically developed for the Cubitus's distinct case. Derived from the architecture of the caliber 240 Q, it features 313 components and Patek's signature 48-month cam system, ensuring accurate tracking of varying month lengths and leap years. The movement’s finishing is intentionally understated, with rhodium-plated bridges, plates, and a micro-rotor creating a largely monochromatic aesthetic. Subtle touches like heat-blued screws and a blue Calatrava cross add hints of color. This contemporary approach to finishing, visible through the display case back, complements the Cubitus's modern appeal.

Reflections on Patek Philippe's Innovative Trajectory

The introduction of the Cubitus Perpetual Calendar Skeleton Ref. 5840P-001 suggests a promising future for Patek Philippe, moving beyond the familiar designs that have dominated its collections. This timepiece is not merely a new model; it's a statement about innovation, a demonstration of how a classic brand can embrace fresh aesthetics while maintaining its revered watchmaking heritage. By adapting the movement to the unique geometry of the square case, Patek Philippe has created a symbiotic relationship between form and function, allowing its Advanced Research department to explore new design horizons. While some might quibble about minor details, such as the contrasting stitching on the strap, the overall impression is one of a brand confidently charting a new course. The Cubitus could very well become a platform for future horological experimentation, potentially paving the way for more daring designs and complex movements, solidifying Patek Philippe's position at the forefront of luxury watchmaking innovation.