This Audemars Piguet Royal Oak Offshore Chronograph reference 26400SO.OO.A002CA.01 brought the Offshore into its larger modern form. Its self-winding movement keeps the focus on the chronograph, the complication that has defined the line since the Offshore first moved beyond the original time-only watch. At 44mm across and 14.1mm thick, the stainless steel case gives the watch the scale that made this generation such a clear break from the earlier 42mm models, while still keeping the proportions disciplined. The silver dial sharpens that contrast further, giving this version a cleaner and more architectural look than the darker, more overtly aggressive variants around it. For a collector drawn to the Offshore at its most direct, that combination of enlarged case and restrained dial is exactly the point. More than a simple size increase, this reference fixed the template for the contemporary Royal Oak Offshore chronograph.