Short description

The Audemars Piguet Royal Oak Selfwinding Chronograph 26240ST.OO.1320ST.04 is the latest-generation 41 mm steel Royal Oak chronograph with a striking green dial and integrated stainless-steel bracelet. Powered by the in-house automatic Calibre 4401 with a 70-hour power reserve, this reference combines the iconic Royal Oak design with a modern flyback chronograph movement, open caseback and 50 m water resistance for confident daily wear.

Overview

The 26240ST marks the new generation of Royal Oak Selfwinding Chronographs, introducing Audemars Piguet’s latest in-house chronograph movement into the classic 41 mm steel case. Reference 26240ST.OO.1320ST.04 pairs this architecture with a vivid green dial and full stainless-steel bracelet, delivering a contemporary, high-impact take on the Royal Oak aesthetic.

With its integrated bracelet, octagonal bezel and “tapisserie”-patterned dial, this watch is instantly recognizable as a Royal Oak, while the green colorway and updated movement set it apart from earlier chronograph references.

Design & Wrist Presence

The 41 mm stainless-steel case retains all the signature Royal Oak elements:

• octagonal bezel with exposed hexagonal screws

• sharp, polished bevels contrasting with fine brushing

• fully integrated stainless-steel bracelet tapering elegantly to the folding clasp

The green dial (with its characteristic texture and applied indexes) gives the watch a dynamic, modern look. Depending on the light, it can shift from deep green to a brighter tone, making the watch feel alive on the wrist. The layout features:

• three sub-dials for the chronograph and small seconds

• applied hour markers and hands with luminescent material

• a discreet date window integrated into the dial design

On the wrist, the 41 mm case and steel bracelet provide substantial presence without feeling oversized. The integrated construction sits flat and hugs the wrist, while the slim profile allows the watch to slip under a cuff.

Movement & Performance

At the heart of the 26240ST is the in-house Calibre 4401, a modern automatic chronograph movement designed by Audemars Piguet. According to your data, it offers:

• 70-hour power reserve

• automatic winding

• chronograph with central seconds, 30-minute and 12-hour counters

• small seconds

• date display

The movement architecture is designed for robust timekeeping and smooth chronograph operation, with contemporary construction and finishing visible through the open caseback. The sapphire back allows you to appreciate the rotor, column-wheel/chronograph elements and decorative work.

With 50 m / 5 bar water resistance, the watch is suitable for everyday life—resistant to splashes, rain and typical daily exposure to water—while staying firmly in the category of high-end luxury sports watch rather than a dedicated dive instrument.

Key technical highlights

• Calibre: 4401, automatic, in-house

• Power reserve: 70 hours

• Functions: hours, minutes, chronograph, date, small seconds

• Water resistance: 50 m / 5 bar

• Case back: Open

• Buckle: Folding clasp

Who is this watch for?

This reference is ideal for:

• collectors who want a modern Royal Oak chronograph with the latest in-house movement

• buyers looking for a steel luxury sports chronograph with a strong, contemporary color statement

• enthusiasts who appreciate the combination of integrated bracelet, iconic case design and a modern automatic chronograph caliber

• anyone seeking a single “hero” watch that can work as both a daily piece and a standout event watch

Benefits

• Iconic Royal Oak design with octagonal bezel and integrated stainless-steel bracelet.

• Modern 41 mm case size offering strong presence while remaining wearable for daily use.

• Green dial for a distinctive, contemporary look with rich color play in different lighting.

• In-house automatic Calibre 4401 with an extended 70-hour power reserve.

• Full chronograph functionality plus date and small seconds for practical everyday use.

• Open caseback showcasing the movement and its finishing.

• 50 m water resistance, making it suitable for everyday conditions.

Use cases

• Daily business wear – a high-end steel chronograph that fits under a cuff but clearly stands out.

• Events and evenings out – the green dial and polished accents catch the light beautifully in indoor settings.

• Weekend and travel watch – one watch that can cover casual, smart casual and formal outfits.

• Collection centerpiece – for many, a Royal Oak chronograph in steel is a central piece within a modern collection.

FAQ

Q1: Is the Audemars Piguet Royal Oak Selfwinding Chronograph 26240ST.OO.1320ST.04 suitable for daily wear?

A1: Based on its 41 mm steel case, integrated bracelet, 50 m water resistance and 70-hour automatic chronograph movement, this reference is well suited for daily use, provided it is treated with the care expected for a high-end luxury watch.

Q2: What is the advantage of the Calibre 4401 in this model?

A2: Calibre 4401 is an in-house automatic chronograph movement designed to provide a long power reserve, modern chronograph architecture and a clear view of the mechanism through the open caseback. It represents AP’s latest chronograph technology in the Royal Oak line.

Q3: Is the movement visible?

A3: Yes. The watch features an open caseback, allowing you to see the automatic Calibre 4401 and its finishing in operation.

Q4: What wrist size does the 41 mm case suit best?

A4: The 41 mm Royal Oak chronograph generally suits medium to larger wrists. The integrated bracelet and case geometry create a strong wrist presence, so buyers who prefer a more compact look might consider smaller references, while those who like a bold sports watch will find this size ideal.

Q5: Does this watch come with box and papers?

A5: This watch is offered as a full set with box and papers

Q6: Can I see the watch in person or via video?

A6:  Absolutely, you can make an appointment at any time by submitting form below or contact us via WhatsApp or Phone call at +971585251224