Patek Philippe’s audacious Cubitus collection, first introduced in October 2024, has taken a significant leap into the realm of high complications with the unveiling of the Cubitus Perpetual Calendar Skeleton Ref. 5840P-001 at Watches and Wonders 2026. This new masterpiece builds upon the collection’s foundational mission to reinterpret the "elegant, sporty" aesthetic through a distinctive case design that masterfully blends square, circular, and octagonal elements. While the initial Cubitus models sparked debate due to their perceived resemblance to the iconic Nautilus and the integration of a round movement within a square case, the Ref. 5840P-001 addresses these points head-on, presenting a visually arresting open-worked dial and, crucially, a newly shaped, skeletonized movement designed specifically for its unique architecture.
The Cubitus collection was conceived by Patek Philippe as a fresh commercial venture, intended to capture attention and offer a distinct alternative in the luxury sports watch market. The initial wave of models, featuring time and date complications housed within the signature square bezel with rounded corners and an integrated bracelet, immediately drew comparisons to the legendary Nautilus. This similarity, coupled with the earlier use of a round movement, fueled skepticism among some enthusiasts and critics. However, the Patek Philippe Cubitus Perpetual Calendar Skeleton Ref. 5840P-001, with its CHF 150,000 price tag (approximately €176,700 / US$187,547), signals a definitive evolution, pushing the collection into a more complex and artistically refined territory.
A Bold Reimagining: The Cubitus Evolves
The Cubitus collection’s design philosophy, aiming to fuse geometric influences, has been a focal point since its inception. Patek Philippe articulated the goal as creating a timepiece that embodies "elegant, sporty" characteristics through a form that "blends the square, the circle, and the octagon." The initial Cubitus models, characterized by their robust case, integrated bracelet, and sporting demeanor, were clearly positioned as a potential successor or complement to the Nautilus. The release of smaller, precious-metal variants in 2025 further expanded the collection’s appeal.
However, Watches and Wonders 2026 marked a pivotal moment for the Cubitus line. The introduction of the Ref. 5840P-001, a grand complication, dramatically shifts the narrative. The open-worked dial, reminiscent of Venetian blinds, not only provides an intriguing visual dimension but also serves to distance the watch from its earlier, more Nautilus-like iterations. This strategic design choice, combined with the innovative Caliber 28-28 Q SQU, a movement engineered with a distinctly non-round, shaped architecture, underscores Patek Philippe’s commitment to pushing the boundaries of both design and horological engineering.
Engineering Marvel: The Caliber 28-28 Q SQU
The heart of the Cubitus Perpetual Calendar Skeleton Ref. 5840P-001 is the newly developed Caliber 28-28 Q SQU. This ultra-thin, automatic winding movement is a testament to Patek Philippe’s prowess in miniaturization and complication. Derived from the architecture of the renowned Caliber 240 Q, the Caliber 28-28 Q SQU has been meticulously adapted to fit the unique geometry of the Cubitus case. This bespoke development ensures that the movement’s layout maximizes the available space while harmoniously integrating with the collection’s linear design language.
With 313 components, the skeletonized perpetual calendar movement showcases the intricate workings of timekeeping. It features the established 48-month cam system, a hallmark of Patek Philippe perpetual calendars based on the 240 architecture, ensuring accurate display of the day, date, month, leap year cycle, and moon phases. The automatic winding is driven by a micro-rotor, contributing to the movement’s slim profile. The movement operates at a frequency of 21,600 vibrations per hour (3Hz) and boasts a maximum power reserve of 48 hours.
A Symphony of Platinum and Platinum: Case and Materials
The Cubitus Perpetual Calendar Skeleton Ref. 5840P-001 is presented in a substantial 950 platinum case, measuring an imposing 45mm in diameter and a remarkably slim 10mm in thickness. This slender profile, especially considering the complexity of the perpetual calendar mechanism, contributes to its wearability, although on smaller wrists, its considerable presence and weight may still be pronounced. The case construction utilizes a two-part design with lateral lugs, a characteristic shared with earlier large Cubitus models.
The interplay of polished and vertically satin-brushed surfaces lends a sophisticated visual dynamism to the case, accentuating its predominantly square form. A hallmark of Patek Philippe’s platinum creations, a diamond is set at the 6 o’clock position. For the Ref. 5840P-001, Patek Philippe has opted for a baguette-cut diamond, a choice that aesthetically complements the watch’s angular design more effectively than the traditional round diamond. The integrated bracelet, also crafted from platinum, features a fold-over clasp with three independent safety catches, further enhancing the watch’s luxurious feel and secure fit.
The Art of Transparency: A Dial Unlike Any Other
The dial of the Ref. 5840P-001 is arguably its most striking feature. Patek Philippe has employed laser-cut strips, treated with a blue PVD coating and finished with horizontal brushing, to create a horizontally open-worked motif. This design choice serves multiple purposes: it offers a tantalizing glimpse into the skeletonized movement below, provides a visual contrast to the predominantly monochromatic mechanics, and subtly echoes the horizontal lines of the movement’s architecture.
Applied white-gold hour markers and baton hands, filled with luminescent material, ensure excellent legibility for the time display. Complementing these are slender white-gold hands dedicated to indicating the perpetual calendar functions: day, date, month, leap year, and moon phases. The overall effect is a dial that is both technically impressive and artistically captivating, inviting the wearer to explore its intricate details.
The Dominating Moon: A Celestial Masterpiece
A prominent feature of the dial is the large, single moon-phase display. Departing from the more conventional dual-moon aperture, this oversized celestial indicator occupies a significant portion of the dial, providing a captivating focal point. The display completes a full rotation every 29.53 days, utilizing layered mineral-glass discs to create a profound sense of depth. Engraved stars and blue varnish form the backdrop, while a separately structured moon disk, detailed with a realistic lunar surface, adds a tactile and visual richness.
While this sophisticated single-moon display has been seen in limited-edition Patek Philippe pieces before, its inclusion in a regular-production model like the Ref. 5840P-001 is noteworthy. It integrates seamlessly with the open-worked dial, drawing the eye without overwhelming the overall composition, a delicate balance that can be challenging to achieve in highly complicated timepieces.
A Contemporary Finish: Movement Decoration and Presentation
Patek Philippe’s reputation for exceptional movement finishing is world-renowned, and the Caliber 28-28 Q SQU upholds this legacy, albeit with a deliberate contemporary twist. Instead of the highly ornate traditional finishing, Patek Philippe has opted for a more restrained aesthetic. The bridges, plates, and micro-rotor are rhodium-plated, resulting in a largely monochromatic appearance. Small accents of color are introduced through heat-blued screws, and a blue Calatrava cross emblem on the movement provides a subtle yet distinctive touch.
This modern, casual approach to finishing is remarkably well-suited to the Cubitus collection’s sporty elegance and likely appeals to its target demographic. While the open-worked dial offers glimpses of the movement’s intricate structure, the sapphire crystal case back provides an unimpeded view of the Caliber 28-28 Q SQU’s full glory, a crucial element for enthusiasts who appreciate the finer details of horological artistry.
The Future of Cubitus: A Platform for Innovation
The introduction of the Cubitus collection was initially perceived by some as an attempt to divert attention from the Nautilus, particularly in anticipation of its 50th anniversary celebrations. However, the Cubitus Perpetual Calendar Skeleton Ref. 5840P-001 has arguably surpassed this initial expectation. It has transformed the collection into a dynamic platform for Patek Philippe’s forward-thinking design and technical innovation.
The use of the distinctive Cubitus case to house new and complex movements, such as the Caliber 28-28 Q SQU, suggests a strategic direction for the collection. It hints at the potential for a deeper synergy between case architecture and movement design in future iterations. This trajectory could signify a new era for Patek Philippe, potentially granting its Advanced Research department, established in 2005, greater opportunities to showcase groundbreaking innovations and inventions within a distinctively designed collection.
A Minor Quibble: The Strap Controversy
While the technical and aesthetic achievements of the Ref. 5840P-001 are undeniable, one element that has drawn a critical eye is the integrated strap. The navy-blue composite strap, featuring a textile pattern and contrasting cream stitching, has been described as a "cheap trick" that detracts from the watch’s otherwise high-end appeal. Despite the sophisticated platinum folding clasp, the contrast stitching stands out as a detail that might be considered unfitting for a maison of Patek Philippe’s caliber. This minor point, however, does not diminish the overall horological significance and artistic merit of this complex timepiece.
Conclusion: A Bold New Chapter
The Patek Philippe Cubitus Perpetual Calendar Skeleton Ref. 5840P-001 represents a significant evolution for the Cubitus collection. It moves beyond its initial comparisons to the Nautilus, establishing itself as a distinct entity capable of housing Patek Philippe’s most sophisticated complications and daring designs. The shaped, skeletonized movement, the innovative open-worked dial, and the overall commitment to pushing horological boundaries suggest that the Cubitus is poised to become a crucial platform for future innovation at Patek Philippe, potentially paving the way for a new era of design and mechanical excellence. As the collection continues to evolve, the question remains: what other complications and design innovations will Patek Philippe explore within this captivating square-inspired architecture?
Watch Specifications:
- Model: Cubitus Perpetual Calendar Skeleton
- Reference: 5840P-001
- Dial: Skeletonized, horizontal motif with blue PVD coating, applied luminous indexes, and three sub-dials.
- Case Material: 950 platinum
- Case Dimensions: 45mm (diameter) × 10mm (thickness)
- Case Back: 950 platinum and sapphire crystal
- Movement: Patek Philippe Caliber 28-28 Q SQU: ultra-thin perpetual calendar, automatic winding via micro-rotor, 21,600 vph (3Hz) frequency, 48-hour maximum power reserve.
- Water Resistance: 30 meters
- Strap: Integrated navy-blue composite with textile pattern, cream stitching, platinum fold-over clasp with three independent safety catches.
- Functions: Time (hours, minutes, small seconds, 24-hour display), perpetual calendar (day, date, month, leap year cycle), and moon phases.
- Price: CHF 150,000 / €176,700 / US$187,547
