Patek Philippe 5726A (Pre-owned - Good) — USD 96,400 on eBay

The Patek Philippe Reference 5726A represents a significant milestone in the manufacture s modern steel sports collection, introduced as part of the prestigious Nautilus Annual Calendar lineup. This reference builds upon the legendary Nautilus heritage established with the iconic Ref. 3700/1A in 1976, while incorporating one of horology s most sophisticated complications. The 5726A stands as a testament to Patek Philippe s ability to seamlessly blend Gerald Genta s revolutionary porthole-inspired design with haute horlogerie complications, marking a pivotal moment when the brand expanded the Nautilus collection beyond simple time-only and GMT variants into the realm of annual calendar complications. At the heart of the 5726A beats the exceptional Caliber 324 S QA LU 24H/303, a self-winding movement that showcases Patek Philippe s mastery of calendar complications. This sophisticated caliber features the annual calendar complication that accurately displays the date, day, month, moon phases, and 24-hour indication while requiring correction only once per year at the end of February. The movement incorporates Patek Philippe s signature Gyromax balance and Spiromax silicon balance spring, ensuring superior precision and resistance to magnetic fields. The caliber delivers a power reserve of approximately 45 hours and operates at 28,800 vibrations per hour, maintaining the brand s exacting chronometric standards. The 5726A s design excellence is immediately apparent in its 40.5mm steel case, which perfectly balances the increased complexity of the annual calendar display within the Nautilus s distinctive octagonal bezel and integrated bracelet architecture. The blue sunburst dial creates a mesmerizing backdrop for the symmetrically arranged subsidiary dials, featuring the characteristic horizontal embossed pattern that has become synonymous with the Nautilus collection. Protected by sapphire crystal and maintaining 30 meters of water resistance, this reference represents exceptional collectibility within the contemporary Patek Philippe market. The combination of stainless steel construction, annual calendar complication, and Nautilus provenance positions the 5726A as a cornerstone piece for serious collectors, representing both the evolution of the Nautilus line and Patek Philippe s commitment to producing complicated timepieces in their most sought-after case material.