Audemars Piguet Royal Oak Selfwinding Chronograph Ref. 26240ST.OO.1320ST.04 – Stainless Steel

 

Audemars Piguet Royal Oak Selfwinding Chronograph

 

 

 

Ref. 26240ST.OO.1320ST.04 – Stainless Steel

 

 

The Audemars Piguet Royal Oak Chronograph 26240ST is a modern evolution of one of the most iconic luxury sports watches ever created. Originally designed by legendary watch designer Gérald Genta, the Royal Oak revolutionized the watch industry in 1972 with its bold industrial aesthetic, integrated bracelet, and instantly recognizable octagonal bezel secured by eight hexagonal screws.

 

This contemporary Selfwinding Chronograph reference continues that legacy with refined proportions, a cutting-edge in-house movement, and unmistakable Royal Oak design language.

 

Crafted from stainless steel with alternating satin-brushed and polished finishing, the 41mm case showcases Audemars Piguet’s renowned hand-finishing. The watch features the signature “Grande Tapisserie” patterned dial, offering exceptional depth and texture while maintaining perfect legibility.

 

The chronograph layout features three subdials with a redesigned vertical alignment, including a 30-minute counter, 12-hour counter, and small seconds, complemented by a date display at 4:30. Applied white gold hour markers and Royal Oak hands with luminescent coating provide outstanding visibility.

 

Powering the watch is the Audemars Piguet Caliber 4401, a sophisticated integrated flyback chronograph movement designed and manufactured entirely in-house. Visible through the sapphire caseback, the movement showcases beautiful finishing including Geneva stripes, beveling, and a 22k pink gold oscillating rotor.

 

The integrated Royal Oak stainless steel bracelet offers exceptional comfort and elegance, tapering perfectly to the wrist and secured with a double folding clasp.

 

The result is a watch that blends high horology, sport, and luxury, making it one of the most sought-after modern Royal Oak references.

 

 

 

 

Specifications

 

 

Brand: Audemars Piguet

Model: Royal Oak Selfwinding Chronograph

Reference: 26240ST.OO.1320ST.04

Year: 2025

Condition: New / Unworn

Scope: Complete Set – Includes original box, papers, card, and double factory hang tags

 

Case Material: Stainless Steel

Case Diameter: 41 mm

Case Thickness: Approx. 12.4 mm

Bezel: Octagonal stainless steel with polished bevels

Crystal: Sapphire crystal with anti-reflective coating

Caseback: Sapphire display caseback

 

Dial: Grande Tapisserie patterned dial

Hour Markers: Applied white gold with luminescent coating

 

Movement: Audemars Piguet Caliber 4401

Type: Self-winding automatic flyback chronograph

Power Reserve: Approximately 70 hours

Frequency: 28,800 vibrations per hour (4 Hz)

Jewels: 40

 

Functions:

• Hours

• Minutes

• Small seconds

• Flyback chronograph

• 30-minute counter

• 12-hour counter

• Date display

 

Bracelet: Integrated stainless steel Royal Oak bracelet

Clasp: AP double folding clasp

 

Water Resistance: 50 meters (165 feet)

 

Weight: Approximately 180 grams

 

 

 

 

Highlights

 

 

• Iconic Royal Oak design by Gérald Genta

• Fully in-house AP Caliber 4401 flyback chronograph

• Sapphire exhibition caseback

• Signature integrated Royal Oak bracelet

• Complete 2025 full set with box, card, and double tags