This Royal Oak Perpetual Calendar represents one of Audemars Piguet's greatest technical triumphs: an ultra-thin self-winding perpetual calendar that, at its launch, ranked among the slimmest ever made. Squeezing a full perpetual calendar, one of horology's most complex mechanisms, into so slender a profile is a feat that eludes most manufactures entirely. Rendered in an exotic blend of titanium and Bulk Metallic Glass and finished with a warm pink dial, it fuses record-setting engineering with truly wearable elegance.

The 41mm case is astonishingly thin, built from titanium paired with Bulk Metallic Glass, an amorphous alloy of unusual properties, and topped by the octagonal bezel with eight hexagonal screws. The pink sunburst dial arranges the calendar with perfect symmetry: day at nine, month and leap year at three, date and week around six, and an astronomical moon phase at twelve. A slim self-winding movement drives it all, completing a masterpiece of ultra-thin watchmaking.