This replica nautilus 57261A blue 40.5mm steps beyond time-only territory with the 5726/1A Annual Calendar, adding day, date, month, and moon phase displays to the Nautilus platform. Patek Philippe introduced the 5726/1A as a steel complication piece that keeps the sport-watch DNA of the Nautilus while delivering genuine horological depth. The dark blue dial carries the signature horizontal embossing and uses four apertures plus a subdial to present all calendar information without cluttering the 40.5mm face.

Case & Movement Specs

• Reference: 5726/1A
• Case diameter: 40.5mm
• Case material: stainless steel
• Dial: dark blue with horizontal embossing
• Functions: annual calendar (day, date, month), moon phase, 24-hour indicator
• Movement: automatic
• Crystal: sapphire

The annual calendar complication tracks months with 30 and 31 days automatically, requiring manual correction only once per year on March 1. That single-correction convenience is what separates an annual calendar from a simple triple-date watch.

Caliber Breakdown

Patek Philippe used the Caliber 324 S QA LU for the 5726/1A, which integrates the annual calendar module with a moon phase display accurate to one day of deviation every 122 years. The day and month appear in twin apertures at 12 o’clock, the date sits in a window between 4 and 5, and the moon phase occupies a subdial at 6. Despite the added complexity, the case thickness stays controlled enough to wear comfortably under a shirt cuff. Explore more options in the Nautilus range, or look at the white dial 5726/1A for a brighter take on the same reference.

How It Compares

The 5726/1A competes in a category where most annual calendars come in precious metal at significantly higher price points. Getting this complication in stainless steel within the Nautilus silhouette was a deliberate move by the brand to offer a gateway to complicated watchmaking without the precious-metal premium. The dark blue dial remains the most popular color for this reference, consistent with the broader Nautilus trend where blue outsells every other option by a wide margin. Among steel annual calendars, very few competitors match the combination of sport-watch aesthetics and complication depth that this reference delivers. This replica nautilus 57261A blue 40.5mm brings annual calendar sophistication to the wrist without leaving the sport-watch comfort zone.