Table of Contents
The reference 26331ST represents Audemars Piguet's refined interpretation of the integrated sports chronograph, combining the Royal Oak's distinctive angular architecture with enhanced dial legibility introduced during the 2017 model revision. This stainless steel chronograph exemplifies the manufacturer's ability to evolve established designs while maintaining core aesthetic principles. The blue "Grande Tapisserie" dial paired with rhodium-toned subdials creates a reverse panda configuration that has captivated collectors since its introduction.
Design Evolution and 2017 Updates
The 2017 facelift of the Royal Oak Chronograph line introduced significant improvements to dial functionality without compromising the model's established aesthetic language. The enlarged chronograph registers represent the most substantial modification, addressing previous generation criticisms regarding subdial legibility. This reference specifically employs a two-tone dial concept that creates visual hierarchy through contrast rather than color gradation.
Grande Tapisserie pattern detail revealing the intricate guilloché work and rhodium subdial contrast
The blue "Grande Tapisserie" guilloché pattern maintains its position as a Royal Oak signature element, created through a precise engine-turning process that generates consistent geometric depth across the dial surface. The rhodium-toned subdials at 3, 6, and 9 o'clock positions interrupt this pattern deliberately, creating distinct zones for chronograph information. White gold applied markers and hands receive luminescent treatment, ensuring darkness visibility while preserving the luxury positioning inherent to precious metal appointments.
Case Architecture and Technical Specifications
The 41mm case diameter has become the contemporary standard for Royal Oak Chronographs, offering substantial wrist presence without excessive bulk. At 11mm thickness, the case maintains proportional elegance despite housing a complex chronograph movement. The 51.7mm lug-to-lug measurement accommodates diverse wrist sizes, though the integrated bracelet design limits adjustability compared to traditional lug configurations.
Side profile highlighting the 11mm case thickness and signature angular construction
Total weight reaches 176 grams, positioning the piece just under half a pound—substantial enough to convey quality without becoming cumbersome during extended wear. The angular case construction featuring alternating brushed and polished surfaces remains faithful to Gérald Genta's original 1972 design language. The octagonal bezel secured by eight hexagonal screws continues to serve as the collection's most recognizable visual signature.
Integrated bracelet showcasing alternating brushed and polished finishing techniques
Caliber 2385 Movement Analysis
The in-house caliber 2385 represents Audemars Piguet's dedication to manufacturing independence, providing integrated chronograph functionality with column wheel actuation. The 40-hour power reserve reflects traditional movement architecture prioritizing reliability over extended autonomy. This caliber operates at 21,600 vibrations per hour, a frequency that balances precision with component longevity.
Exhibition caseback revealing the caliber 2385 movement with column wheel chronograph
Chronograph subdials provide comprehensive timing information: 30-minute totalizer at 3 o'clock, 12-hour counter at 9 o'clock, and running seconds at 6 o'clock. The date aperture positioned at 4:30 maintains visual balance while preserving dial symmetry. Water resistance rated at 50 meters accommodates recreational swimming but falls short of serious diving requirements—appropriate given the model's dress-sport positioning.
Secondary Market Positioning
Production cessation in 2022 transformed the 26331ST into a secondary market exclusive, with availability now limited to pre-owned inventory and dealer networks. This discontinuation has stabilized values while creating acquisition challenges for collectors seeking specific dial configurations. The blue reverse panda variant maintains particular desirability due to its versatility across casual and formal contexts.
On-wrist presence demonstrating the 41mm case proportions and bracelet integration
Market positioning reflects the reference's status as a transitional model between earlier and current generation Royal Oak Chronographs. The 2017 improvements address functional concerns while preserving collectible appeal associated with discontinued references. Current inventory availability through specialized dealers like Watches Off 5th provides acquisition opportunities for collectors who missed the retail window.
Presentation in AP box
The reference 26331ST.OO.1220ST.01 occupies a compelling position within the Royal Oak chronograph lineage, representing the final evolution before subsequent model updates. The combination of enlarged subdials, refined case proportions, and the striking blue reverse panda colorway creates a package that satisfies both aesthetic preferences and functional requirements. For collectors seeking an integrated luxury sports chronograph with proven secondary market stability, this discontinued reference merits serious consideration.
The reference 26331ST positioned on display pillow highlighting dial dimensionality