The Audemars Piguet Royal Oak Selfwinding Chronograph reference 26240ST.OO.1320ST.04 is a 41mm luxury timepiece released to commemorate the 50th anniversary of the Royal Oak collection. Constructed from stainless steel with a mix of brushed and polished finishes, the case features the iconic octagonal bezel with exposed screws and a scratch-resistant sapphire crystal and caseback. It is powered by the in-house Calibre 4401 automatic movement, which offers a 70-hour power reserve and features a special 50 Years oscillating weight visible through the transparent caseback.
In terms of complications, this model is equipped with a flyback chronograph, allowing the wearer to reset the timer without stopping it first. The khaki green dial, decorated with the Grande Tapisserie pattern, includes white gold applied hour-markers and hands with luminescent coating for visibility. Functional displays include central hours and minutes, small seconds at 6 o’clock, and a date window positioned between 4 and 5 o’clock. The watch is integrated with a matching stainless steel bracelet and is water-resistant up to 50 meters.
General reviews of the 26240ST.OO.1320ST.04 praise its striking green dial and the high level of hand-finishing on both the case and the movement’s rotor. Collectors often note its significant wrist presence, as the integrated lug design and 51.4mm lug-to-lug length make it wear larger than its 41mm diameter suggests. While the aesthetics and mechanical upgrades are highly regarded, some users mention that the stainless steel surfaces are prone to showing minor scratches and that the watch’s profile may feel substantial on smaller wrists.