Patek Philippe Nautilus Annual Calendar Moon Phase 40.5mm Stainless Steel Self-Winding

The Patek Philippe Nautilus Ref. 5726/1A-014 represents complications achievement in stainless steel sports watch architecture. This 40.5mm timepiece combines annual calendar with moon phase functionality. Blue sunburst dial displays day, date, and month via subdials and apertures. Manufacture Caliber 324 S QA LU 24H delivers 45 hours autonomy with annual calendar requiring single adjustment per year. Stainless steel integrated bracelet maintains Nautilus horizontal embossing established 1976. Water resistance to 120 meters enables active lifestyle wear.

Reference 5726 introduced 2017 brought annual calendar complication to steel Nautilus lineup previously limited to precious metals. Caliber 324 S QA LU 24H evolved from base automatic architecture with annual calendar module, moon phase, and 24-hour indication. Movement beats at 28,800 vph with 34 jewels. Annual calendar displays day and month via subdials at 9 and 3 o'clock while date appears in window at 6 o'clock alongside moon phase. 24-hour subdial enables AM/PM distinction. Blue dial features horizontal embossed pattern creating Nautilus signature texture. Applied hour markers in white gold with luminous fill ensure legibility.

Stainless steel integrated bracelet features multiple links with polished and brushed finishing creating visual depth. Fold-over clasp ensures secure attachment. Sapphire exhibition caseback reveals hand-finished movement with Côtes de Genève and Patek Philippe Seal certification. This preowned example represents rare steel Nautilus with complications commanding premium positioning. Annual calendar and moon phase appeal to collectors seeking functionality beyond time-and-date simplicity. Steel construction provides accessible entry versus rose or white gold alternatives while maintaining Nautilus design language and manufacture complications creating highly collectible configuration.