Audemars Piguet Perpetual Calendar Openworked

Audemars Piguet's Perpetual Calendar Openworked, reference 26443NB.OO.D002CR.01, has a black ceramic case measuring 41 mm. The dial is fully skeletonized, revealing the architecture of the self-winding calibre 7139 beneath a sapphire crystal. This movement drives a perpetual calendar with day, date, month and week indication, along with an astronomical moon phase display. The openworked construction lets the calendar mechanism show through rather than hide behind a solid dial. AP pairs the case with a black alligator leather strap, closed by an 18-carat white gold three-blade folding clasp. The clasp itself is finished in the same white gold as the calendar's finer bridges. Water resistance stands at 30 metres.