The Audemars Piguet Royal Oak Selfwinding Chronograph reference 26240ST.OO.1320ST.08 is a 41mm luxury sports watch crafted from stainless steel. It features the collection’s signature octagonal bezel with eight hexagonal screws and a khaki green dial adorned with the Grande Tapisserie pattern. The case measures 12.4mm in thickness and includes a screw-locked crown and glareproofed sapphire crystal on both the front and the open caseback. This model is paired with an integrated stainless steel bracelet that features a slimmed-down design for enhanced aesthetics and an AP folding clasp.
The timepiece is powered by the in-house Calibre 4401, a self-winding movement that provides approximately 70 hours of power reserve. As a flyback chronograph, it allows the user to stop, reset, and start the chronograph function with a single press of the lower button. The movement architecture includes a vertical clutch system and a column wheel, ensuring a smooth engagement of the chronograph hands. Additional complications include a date display located between the 4 and 5 o’clock positions and small seconds. The watch is water-resistant to 50 meters, making it suitable for light splashes but not for deep-sea diving.
General reviews of the 26240ST often emphasize its exceptional wrist presence and high-quality external finishing, noting that the bracelet and case angles catch light remarkably well. While its 41mm diameter and 51.5mm lug-to-lug length make it a substantial piece that wears more like a 43mm watch, critics and owners alike praise its versatility for both casual and formal attire. However, some users have reported reliability issues with the Calibre 4401 movement, specifically regarding the alignment or drifting of the chronograph minute hand. Despite these technical concerns, the green dial version is highly regarded for its unique aesthetic and perceived value within the collector community.