Audemars Piguet 26240ST.OO.1320ST.05 Royal Oak Selfwinding Chronograph Stainless Steel Blue Dial Watch

Audemars Piguet Royal Oak Selfwinding Chronograph – Ref. 26240ST.OO.1320ST.05

Introducing the Audemars Piguet Royal Oak Selfwinding Chronograph (Ref. 26240ST.OO.1320ST.05), unveiled in 2022 as the new flagship chronograph in stainless steel. Built on the latest Royal Oak design evolution, this 41 mm icon features a captivating “Bleu Nuit, Nuage 50” Grande Tapisserie dial and integrates the high-performance Calibre 4401 automatic chronograph movement.

Case Bracelet

• Material: Robust stainless steel case, bezel, and integrated bracelet featuring brushed surfaces and polished chamfers, secured with an AP folding clasp.
• Dimensions: 41 mm in diameter and 12.4 mm thick, with a screw-locked crown and glare-proof sapphire crystals front and back.
• Water Resistance: 50 meters (5 ATM), ideal for daily wear.

Dial Hands

The striking blue “Grande Tapisserie” dial—nicknamed “Bleu Nuit, Nuage 50”—features matching chronograph counters that add depth and texture. Applied white‑gold hour markers and Royal Oak hands are treated with luminescent coating for enhanced readability in diverse lighting environments. A discreet date window between 4 and 5 o’clock ensures a symmetrical yet functional layout.

Movement Chronograph Functionality

• Calibre 4401: A fully integrated in-house automatic chronograph calibre featuring a vertical-clutch mechanism, column wheel architecture, and fly‑back function. The movement operates at 4 Hz (28,800 vph) and offers an impressive 70‑hour power reserve.
• Functions: Central chronograph seconds, 30‑minute and 12‑hour registers, small seconds, date, and fly‑back—engineering that blends precision with convenience.

Unique Characteristics

What makes the Ref. 26240ST stand out is its perfect synthesis of Royal Oak heritage and modern watchmaking innovation. Introduced to replace the limited 50th‑Anniversary model, it offers updated case-bevel refinement and wider bracelet links for optimal ergonomics. The bold blue theme—a nod to the original Royal Oak—enhances its visual identity within the collection.

Technical Specifications

• Reference: 26240ST.OO.1320ST.05
• Case Bracelet: Stainless steel; 41 mm × 12.4 mm; 50 m WR
• Dial: Bleu Nuit, Nuage 50 Grande Tapisserie with white‑gold hands/markers
• Movement: Calibre 4401 automatic; vertical clutch; fly‑back; 70‑h power reserve
• Functions: Hours, minutes, small seconds, date, chronograph
• Crystal: Sapphire front and back, anti‑glare

Collector Appeal Investment Potential

Since its release, the Ref. 26240ST has quickly become a market favorite, ranking among the top 4 % in Royal Oak popularity and top 2 % across all brands by popularity in June 2025.

Conclusion 26240ST.OO.1320ST.05

The Audemars Piguet Royal Oak Selfwinding Chronograph Ref. 26240ST.OO.1320ST.05 represents the pinnacle of modern sports luxury. With its iconic blue Grande Tapisserie dial, full in-house chronograph movement, and ergonomic refinements, it delivers a compelling proposition: timeless Royal Oak DNA meets cutting-edge timekeeping. Ideal for connoisseurs who seek lasting elegance, precision, and presence, this timepiece defines a new standard in high-performance luxury.