This replica nautilus 5726A0 blue pairs the Nautilus case architecture with an Annual Calendar complication, making the 5726A-001 one of the most functionally complex references in the Nautilus family. At 40.5mm, it sits slightly larger than the standard time-only Nautilus 5711, and that extra half-millimeter accommodates the additional subdials needed to display day, date, and month. Patek Philippe introduced the Annual Calendar mechanism in 1996, and it remains one of the most practical calendar complications available — tracking 30 and 31-day months automatically, requiring manual correction only once per year on March 1st. The blue dial and blue strap combination gives this reference a cohesive monochromatic appearance.

Case & Movement Specs

• Case diameter: 40.5mm
• Case material: stainless steel
• Dial color: blue with subdials
• Crystal: sapphire with anti-reflective coating
• Movement: automatic caliber 324 S QA LU
• Functions: hours, minutes, day, date, month, moon phase
• Strap: blue leather with fold-over clasp

The 324 S QA LU caliber adds the Annual Calendar and moon phase modules to the base 324 SC architecture, increasing the movement height while maintaining the slim wrist profile the Nautilus is known for.

Caliber Performance

The Annual Calendar mechanism tracks months with 30 and 31 days without manual intervention, only requiring adjustment after February. The moon phase indicator at six o’clock provides a secondary complication that adds visual interest to the lower half of the dial. Three subdials at the top of the face display day, date, and month through aperture windows — a layout specific to the Nautilus Annual Calendar that differs from the Complications 5205 window arrangement. The blue dial uses a gradient finish that deepens toward the edges, creating depth perception even on a flat surface. For those exploring other Nautilus configurations, the rubber strap accessory allows converting bracelet references to a sportier wrist presence. The complete Annual Calendar and complication options are viewable in the Nautilus collection.

How It Compares

The 5726A-001 occupies a middle ground between the entry-level 5711 time-only and the high-end 5740 Perpetual Calendar within the Nautilus range. It delivers meaningful complication functionality — tracking the calendar accurately for 11 months without user input — while keeping the interaction simple. The blue-on-blue execution with a leather strap rather than a steel bracelet shifts the wearing character toward dressy territory, distinguishing it visually from the sport-coded bracelet references. This replica nautilus 5726A0 blue delivers that Annual Calendar complication in the Genta-designed Nautilus case with a monochromatic blue presentation that stands apart in the lineup.