The Patek Philippe Cubitus Perpetual Calendar 5840P

On the occasion of Watches and Wonders Geneva 2026, Patek Philippe keeps expanding its Cubitus collection with its first grand complication, a perpetual calendar. Presented in a 45mm platinum case, the model stands out with its openwork design and rectangular movement.

The Patek Philippe Cubitus Collection was unveiled in October 2024. Marking the brand’s first new watch line in 25 years, the design inevitably sparked passionate discussions among aficionados. The initial launch featured three models: the Ref. 5812/1A in stainless steel with a green dial, the Ref. 5812/1AR in steel and rose gold with a blue dial, and the Ref. 5822P in platinum displaying a grand date, day, and moon phase complication. A few months later, Patek Philippe introduced the Ref. 7128/1G and Ref. 7128/1R, featuring 40mm white and rose gold cases. offering a more compact and wearable option while retaining the collection’s distinctive aesthetic. 

Now, Patek Philippe unveils its first grand complication for this collection with the Cubitus Perpetual Calendar 5840P. The watch comes in a 45mm platinum case, only marginally thicker than the 5822P at just 10mm. It retains the design of its predecessors, with a subtly curved square profile. Its polished and satin-brushed surfaces catch the light beautifully, highlighting the watch’s architectural lines. The substantial weight of platinum gives the piece a satisfying presence on the wrist. A signature detail for Patek Philippe’s platinum models, the case is set with a diamond, in this case, a baguette-cut diamond set into the bezel at 6 o’clock. 

The dial is skeletonised to reproduce the characteristic horizontal pattern of the Nautilus and Cubitus line while revealing the watch’s inner workings. The movement and the dial are skeletonised according to the same pattern, with a perfect superposition of their structures. The movement is also rectangular with rounded corners to perfectly match the shape of the case. Quite impressive to say the least – not to mention, as usual with Patek Philippe, the nicely executed decoration. In this respect, the monochrome finish of the movement further lends the watch a surprisingly modern, assertive look. The plate, bridges, wheel plates, balance wheel and gold mini rotor share the same rhodium-plated finish. This is not as simple as one may think. For instance, the different surface treatment in the barrel drum can have repercussions in the adjustment of the escapement! Patek pushed the idea even further, opting for transparent sapphires rather than ruby-colored stones. The monochrome architecture is only highlighted with blue details. The screws are thermally blued, and the Calatrava cross engraved in the micro-rotor is inked in blue.

Comprising 313 parts, the automatic 28-28 Q SQU calibre displays the time in 12-hour and 24-hour formats, minutes, seconds, the date, day of the week, month, moon phases, and leap years. The base calibre is the venerable calibre 240 with micro-rotor. Interestingly, the moon phase is the large display first seen for the World Time Moon Refs. 5575 and 7175 limited editions of 2014. Conventional moon-phase displays use a small dial aperture showing part of a rotating disk with two moons, resulting in a limited view. To offer a larger, more striking depiction, Patek Philippe designed a specific moon-phase display at the centre of the dial. The disk completes one revolution every 29.53 days. A stationary upper disk, metallised with a precisely shaped heart contour, masks the dark portion of the moon, revealing only the visible part on the rotating disk. This large, strikingly realistic moon phase is also distinguished by its meticulous details and play of materials, capturing all the poetry of the lunar relief.

The Patek Philippe Cubitus Perpetual Calendar reference 5840P comes on a navy blue composite strap with a fabric pattern and cream-colored stitching, secured by a platinum fold-over clasp. Price is CHF 150,000.

For more information, please visit www.patek.com.