The Patek Philippe Nautilus reference 5726A-001 is a luxury sports watch that combines the collection’s iconic design with the practical utility of an annual calendar. Introduced in 2010, this model features a 40.5mm stainless steel case with the signature rounded octagonal bezel and a thickness of approximately 11.3mm. The sunburst charcoal grey dial is characterized by its horizontal embossing and black-gradient rim, accented by white gold applied baton hour markers and hands, both of which are treated with luminescent coating for enhanced legibility. Unlike models on a steel bracelet, this reference is traditionally paired with a matte black alligator leather strap or a grey composite strap, secured by a stainless steel fold-over clasp.
At the heart of the 5726A-001 is the self-winding Caliber 324 S QA LU 24H/303, a 347-part movement visible through a sapphire crystal caseback. The annual calendar complication is a standout feature, automatically accounting for months of 30 and 31 days and requiring manual adjustment only once per year at the end of February. The dial displays the day and month through two apertures at the 12 o’clock position, while the date is located at 6 o’clock. This lower sub-dial also integrates a poetic moon phase indicator and a 24-hour scale that serves as an AM/PM indicator. The watch offers a power reserve of 35 to 45 hours and maintains water resistance up to 120 meters, though the leather strap is often noted as being less suitable for swimming than the rubber or steel alternatives.
General reviews of the 5726A-001 frequently praise its symmetrical and balanced dial layout, which many enthusiasts find more aesthetically pleasing than the asymmetrical designs found in other Nautilus complications. Collectors often highlight its versatility, noting that the leather strap allows the watch to transition easily from casual sports settings to more formal attire. While some critics mention that the added thickness of the annual calendar movement makes it slightly bulkier than the time-only Nautilus models, the watch is widely regarded as a highly comfortable and sophisticated “grail” timepiece that holds its value exceptionally well in the secondary market.