Patek Philippe invented the annual calendar complication in 1996 — a mechanism that correctly accounts for months of 30 and 31 days, requiring only a single manual correction per year (at the end of February). The Nautilus 5726 marries this complication with the sport-luxe identity of the Nautilus, adding a moon phase at 6 o'clock. The result is a watch that carries real intellectual weight within the steel bracelet and horizontal-embossed dial that defined the genre. A complete instrument for the principal who requires both technical substance and discretion. Maker: Patek Philippe. Reference: 5726/1A-014. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request.