The Audemars Piguet Royal Oak Perpetual Calendar Ultra-Thin Ref. 26586BA.OO.1240BA.99 is an exceptional expression of haute horlogerie, combining the Royal Oak’s iconic sporting architecture with remarkable ultra-thin engineering. Created as a Greater China Edition and limited to only 88 pieces, this highly exclusive timepiece features a 41mm case crafted from 18-karat yellow gold. Measuring approximately 6.2mm thick, it maintains an exceptionally slender and elegant profile despite housing a sophisticated perpetual calendar mechanism.

The champagne-toned dial creates a refined monochromatic appearance that harmonizes beautifully with the yellow-gold case. Its carefully balanced displays indicate the day, date, month, leap year, astronomical moon phase, and day/night cycle, while applied yellow-gold hour markers and luminous Royal Oak hands provide excellent legibility. The dial is framed by the collection’s signature fixed octagonal yellow-gold bezel, secured by eight polished hexagonal screws and protected by glare-resistant sapphire crystal.

Completing the fully integrated design is an 18kt yellow-gold Royal Oak bracelet featuring meticulously executed satin-brushed surfaces and polished bevels. Its articulated construction follows the contours of the wrist while preserving the strong architectural character of the case. The bracelet is secured by a concealed Audemars Piguet folding clasp, creating a seamless and sophisticated appearance while providing a secure and comfortable fit.

The glare-resistant sapphire crystal caseback reveals the self-winding Audemars Piguet Manufacture Calibre 5133, an ultra-thin perpetual calendar movement measuring only 2.89mm thick. Composed of 256 parts and fitted with 37 jewels, the movement operates at 19,800 vibrations per hour and delivers an approximately 40-hour power reserve. It automatically accounts for the varying lengths of months and leap years while powering the hours, minutes, day, date, month, leap-year, moon-phase, and day/night indications. The watch offers water resistance to approximately 20 meters.

Limited to only 88 examples, the Audemars Piguet Royal Oak 26586BA.OO.1240BA.99 represents an extraordinary union of rarity, technical innovation, and precious-metal craftsmanship. Its ultra-thin construction, sophisticated perpetual calendar, champagne dial, and fully integrated yellow-gold design make this Greater China Edition a particularly desirable acquisition for serious collectors of rare and historically significant Royal Oak timepieces.
 

REF# 26586BA.OO.1240BA.99