Royal Oak 25800 Perpetual Calendar Platinum / Blue

In Context

At 33 mm it is small by current standards, in the range most wristwatches occupied before cases began growing through the 1990s. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse.

The movement winds itself from the motion of your wrist. 40 hours of reserve carries it overnight, but not through a weekend in a drawer. At 28,800 vph the seconds hand advances 8 times a second.

25800PT.O.0789PT.02 stands on its own in this catalogue — no other reference here shares its base number. It pairs a blue dial with a platinum case. Beyond the time it carries a perpetual calendar.

Self-winding movement with perpetual calendar (module 2806). Complete thickness 5.55mm; 20mm casing diameter.