The Audemars Piguet Royal Oak Perpetual Calendar, reference 26598BC.ZZ.1220BC.01, is a 2024 men’s watch with a 41mm white gold case. Baguette-cut diamonds line the octagonal bezel, which is fixed with the Royal Oak’s signature screws. The red dial carries the Grande Tapisserie pattern, a grid of tiny raised squares, with applied baton hour markers and no numerals.
The dial layout is what sets this reference apart. The left subdial shows the day, the right subdial shows the date, and the top subdial shows the month with a leap-year indicator. A moon-phase display sits at 6 o’clock, and a week-number scale runs around the outer track. Because it is a perpetual calendar, it accounts for month lengths and leap years, so you are not stopping to correct the date at the end of a short month. The automatic movement is powered by the motion of your wrist, and a sapphire crystal covers the dial. The white gold bracelet is integrated into the case.
The watch is offered in very good condition with its original box and papers. For a buyer who wants a complex Royal Oak with a complete set behind it, this is a sound choice, and precious-metal Audemars Piguet pieces tend to hold their value over time.

