Here are the key specifications for the Audemars Piguet Royal Oak Selfwinding Chronograph 26240OR.OO.1320OR.04 (18-carat Pink Gold) Specification Details Brand Audemars Piguet Collection Royal Oak Selfwinding Chronograph “50th Anniversary” Reference 26240OR.OO.1320OR.04 Movement Type Self-winding automatic with flyback chronograph (Calibre 4401) Functions Hours, Minutes, Small Seconds, Date, Flyback Chronograph Power Reserve ≈ 70 hours Jewels 40 jewels Frequency 28,800 vph / 4 Hz Case Material 18-carat pink gold Case Diameter 41 mm Case Thickness ~12.4 mm Dial Khaki green “Grande Tapisserie” with matching chronograph counters; pink-gold applied hour markers and hands with luminescence Bezel Royal Oak’s iconic octagonal pink-gold bezel with exposed screws Crystal Glare-proofed sapphire crystal Caseback Sapphire exhibition caseback Bracelet Integrated 18-carat pink gold bracelet with AP folding clasp Water Resistance 50 m / 5 ATM Style / Gender Luxury Sports Chronograph / Men’s & Unisex Origin Swiss Made
