Audemars Piguet presents a new interpretation of one of its most revered complications with the Royal Oak Selfwinding Perpetual Calendar in “Bleu Nuit, Nuage 50” ceramic. Building on the Manufacture’s recent advances in both material innovation and perpetual calendar mechanics, this latest execution combines a deep, historically inspired blue ceramic with the next‑generation Calibre 7138, which streamlines calendar adjustment via the crown alone. The result is a refined yet boldly modern expression of AP’s signature perpetual calendar in an impressively lightweight and monochromatic package.
The 41mm case of the Royal Oak Perpetual Calendar in “Bleu Nuit, Nuage 50” ceramic continues the enduring Royal Oak Jumbo profile, now rendered entirely in deep blue high‑tech ceramic. Measuring just 9.5mm thick, the case maintains the collection’s slim, elegant proportions while benefiting from ceramic’s scratch resistance and low density. Satin‑brushed surfaces and polished bevels are meticulously executed to preserve the sharp geometry that defines the octagonal bezel and integrated case, a technical achievement given the challenge of finishing advanced ceramic.
The caseback combines titanium and sapphire crystal, offering an unhindered view of the Calibre 7138 within. Around the sapphire window, fine bevels and precision ceramic work frame the movement, reinforcing the sense of depth and refinement. 
The visual interplay between the cool blue exterior and the highly finished movement components speaks to AP’s mastery of both technical materials and decorative haute horlogerie.
At 3 o’clock, a ceramic screw‑locked crown orchestrates all time and calendar adjustments thanks to the patented crown‑only system of the new calibre. A glare‑proofed sapphire crystal with anti‑reflective coating protects the dial, providing crystal‑clear views of the perpetual calendar indications. Water‑resistance can reach up to 50 meters (165 feet).
The dial offers a richly textured blue Grande Tapisserie pattern that perfectly complements the “Bleu Nuit, Nuage 50” ceramic case and bracelet. Matching blue sub‑dials and a coordinating inner bezel create a cohesive monochromatic field that keeps the perpetual calendar complications clear and harmonious. Peripheral week indication and the trademark Royal Oak layout reinforce the model’s readability and iconic design ethos.
Applied 18k white gold hour markers and Royal Oak hands are finished with luminescent material, offering crisp contrast against the deep blue background. The perpetual calendar displays, including day, date, month, leap year, and peripheral week, are logically arranged without crowding the dial. At 6 o’clock, the moon phase benefits from a realistic depiction based on NASA imagery, adding a subtly expressive focal point.
The finish across the dial is precise and considered, with the deep colour absorbing light while highlighting the relief of the guilloché pattern. Lume is confined to the hands and hour markers, ensuring low‑light legibility without disrupting the formal symmetry of the display. 
The cohesive palette and structured layout make the perpetual calendar information highly intuitive despite its complexity.
Audemars Piguet Royal Oak Perpetual Calendar in “Bleu Nuit, Nuage 50” Ceramic
The Audemars Piguet Royal Oak Perpetual Calendar in “Bleu Nuit, Nuage 50” Ceramic (Ref#: 26674CD.OO.1225CD.01) is powered by the in‑house self‑winding mechanical movement, caliber 7138 with 41 jewels, 423 components, and 28,800 vph. It comes equipped with a patented all‑in‑one crown system enabling full calendar adjustment without tools or risk to the mechanism. Power reserve can last up to 55 hours, when fully wound.
Mounted on this watch is an integrated “Bleu Nuit, Nuage 50” ceramic bracelet with satin‑brushed surfaces and polished accents, secured by an Audemars Piguet folding clasp. The seamless continuation of ceramic from case to bracelet reinforces the monochromatic aesthetic while the lightweight nature of ceramic ensures exceptional comfort on the wrist. The sophisticated finish and material coherence also give the watch a strong presence in formal and casual settings alike.
For more up to date information visit the official Audemars Piguet website here.
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