Patek Philippe Nautilus Annual Calendar Moon Phase

• Case: Stainless steel, 40.5mm, screw-down crown, sapphire crystal caseback, the iconic porthole-shaped case with alternating polished/satin finishes
• Dial: Sunburst blue dial with a black-gradient rim and horizontally embossed pattern, inspired by the original 1976 Nautilus
Patek Philippe
• Complications: Day/month apertures at 12 o'clock ("THU MAY" as shown), date window at 6 o'clock, plus a moon-phase display with a 24-hour sub-dial at 6 o'clock
• Movement: Self-winding Calibre 324 S QA LU 24H/303 with an annual calendar mechanism and a 45-hour power reserve
Wristcheck
• Bracelet: Integrated stainless steel bracelet with fold-over clasp
• Significance: The annual calendar automatically adjusts date, day, and month, needing correction only once a year (when transitioning from a 30-day month to a 31-day one) — a Patek-patented mechanism. It's one of the most technically sophisticated and sought-after steel Nautilus references.