This stainless steel model integrates an annual calendar complication requiring adjustment only once per year, alongside a moon phase display and 24 hour indicator. The dial layout is balanced with apertures for day and month, a date subdial, and a central sweep seconds hand. The automatic movement provides consistent energy distribution, visible through the sapphire case back. The case dimensions offer presence without bulk, while the bracelet ensures a secure and fluid fit on the wrist.

The 5726/1A is built for practical luxury. It delivers everyday usability through its calendar system while preserving the signature Nautilus identity, making it an ideal piece for collectors who value both function and familiarity.

Patek Philippe Nautilus 5726/1A-014

Reference: 5726/1A-014
Collection: Nautilus
Complications: Annual Calendar, Moon Phases and 24-hour indication
Case Material: Stainless steel
Case Shape: Porthole-inspired Nautilus construction
Case Diameter: 40.5 mm, measured from 10 to 4 o’clock
Case Thickness: 11.3 mm
Water Resistance: 30 m
Crown: Screw-down
Case Back: Sapphire-crystal display back
Bracelet: Stainless-steel integrated Nautilus bracelet
Clasp: Patented stainless-steel fold-over clasp with lockable adjustment system.

Dial: Sunburst blue-gray with a black-gradient rim and horizontally embossed pattern. White-gold applied baton-style hour markers and rounded baton-style hands are finished with white luminescent coating.

Movement: Patek Philippe Calibre 26-330 S QA LU 24H
Movement Type: Self-winding mechanical
Functions: Annual Calendar, day/date/month apertures, moon phases, 24-hour indication and sweep seconds
Movement Diameter: 33.3 mm
Movement Thickness: 5.8 mm
Number of Components: 339
Number of Jewels: 34
Power Reserve: Minimum 35 hours, maximum 45 hours
Rotor: 21K gold central rotor
Balance: Gyromax®
Frequency: 28,800 semi-oscillations/hour (4 Hz)
Balance Spring: Spiromax®
Certification: Patek Philippe Seal.

Calendar System: The Annual Calendar automatically recognizes months containing 30 or 31 days and requires only one correction per year, at the end of February. Patek Philippe states that the Annual Calendar mechanism was invented and patented by the manufacture in 1996.

Alternative Reference / Configuration

5726A-001 — stainless-steel Nautilus Annual Calendar with Moon Phases, but configured on a leather strap rather than the integrated steel bracelet. Patek Philippe currently lists it alongside the 5726/1A-014 as a separate reference.

Reference distinction: The 5726/1A-014 is specifically the steel-bracelet execution, distinguished by its blue-gray sunburst/black-gradient dial.