The Audemars Piguet Royal Oak Chronograph 26240ST.OO.1320ST.05 seamlessly fuses heritage with contemporary performance. Crafted in stainless steel, its 41mm case is instantly recognizable by the iconic octagonal bezel and exposed screws, symbolizing a bold evolution of the original 1972 Royal Oak design. The matching stainless steel bracelet, finely finished with alternating brushed and polished surfaces, ensures both comfort and durability. Its “Bleu nuit nuage 50” dial, a deep night-sky blue achieved through a galvanic bath, features the signature “Grande Tapisserie” pattern—an intricate texture achieved through hand-guilloché techniques passed down through generations.
This timepiece is powered by Audemars Piguet’s in-house Calibre 4401, an automatic flyback chronograph movement introduced in 2021. With a 70-hour power reserve, column-wheel architecture, and vertical clutch, it delivers high precision and smooth activation of chronograph functions. The sapphire caseback reveals the beautifully finished movement with Geneva stripes, circular graining, and the oscillating rotor in 22k gold—offering a glimpse into the brand’s mechanical mastery. Every element has been engineered for enhanced reliability, legibility, and long-term performance under daily wear.
The Royal Oak Chronograph 26240ST pays homage to Gerald Genta’s groundbreaking design while embracing modern refinement. The “Bleu nuit nuage 50” colorway was originally developed for the very first Royal Oak and continues to serve as a visual link to the collection’s origins. This model maintains the sporty elegance that made the Royal Oak a revolutionary luxury sports watch. With its dynamic blend of historical significance, material excellence, and mechanical innovation, this chronograph appeals to collectors who value both heritage and forward-thinking horology—representing Audemars Piguet’s unyielding pursuit of excellence in form and function.
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