Brand: Audemars Piguet Model: Royal Oak Selfwinding Chronograph “50th Anniversary” Reference: 26240OR.OO.D002CR.01 Case Material: 18K rose gold Case Diameter: 41 mm Case Thickness: ~12.6 mm (typical for Royal Oak chronographs) Movement: Automatic self-winding Caliber: AP 2385 (based on Frédéric Piguet 1185) Functions: Hours, minutes, small seconds Chronograph: central chronograph seconds, 30-minute counter, 12-hour counter Date display Power Reserve: Approx. 40 – 50 hours Dial: Signature Royal Oak “Grande Tapisserie” pattern, likely in a commemorative anniversary color (often special blue/grey or unique finish) Bezel: 18K rose gold octagonal Royal Oak bezel with exposed screws Crystal: Sapphire crystal with anti-reflective coating Bracelet: Integrated 18K rose gold bracelet with AP folding clasp Water Resistance: 50 m / 165 ft