Audemars Piguet Royal Oak Selfwinding Chronograph Yellow Gold — Blue Grande Tapisserie Dial 41mm | Ref. 26331BA.OO.1220BA.01

Yellow gold and blue—a pairing that Audemars Piguet has refined across generations of Royal Oak references—achieves its most opulent sporting expression in the ref. 26331BA. Produced between 2017 and 2021, this 41 mm chronograph captures a confident era in the Royal Oak's evolution, presenting an integrated movement and case concept that remains among the most technically unified chronograph architectures in Swiss watchmaking.

The heart of the 26331BA is Calibre 4401, an integrated column-wheel flyback chronograph movement developed entirely in-house, offering a 70-hour power reserve and a flyback function that resets and restarts the chronograph with a single pusher depression. The sunburst blue dial carries the Grande Tapisserie guilloche pattern—Audemars Piguet's signature square-hobnail motif, each boss hand-bevelled—framed by the octagonal 18-carat yellow-gold bezel and echoed in the fully integrated yellow-gold bracelet terminated by the AP folding clasp.

The screw-down crown preserves the Royal Oak's sporting pretensions even within this precious-metal context. Offered with box and papers from the 2017–2021 production window, the 26331BA represents a period piece of considerable future significance—a yellow-gold integrated chronograph that bridges the Royal Oak's sporting lineage with the aspirational collector market.