Audemars Piguet 26674ST.OO.1320ST.01 Royal Oak Perpetual Calendar Stainless Steel Blue Dial Watch

Audemars Piguet Royal Oak Perpetual Calendar – Ref. Case Shape: Octagonal. 26674ST.OO.1320ST.01

The Audemars Piguet Royal Oak Selfwinding Perpetual Calendar (Ref. 26674ST.OO.1320ST.01) represents a bold evolution in one of the most iconic high complications from the Swiss maison. Introduced in 2024, this reference brings together refined sportiness, cutting-edge ergonomics, and a reengineered movement in a classic 41 mm stainless steel case. Offering improved water resistance, streamlined functionality, and striking aesthetic enhancements, this model continues the legacy of the Royal Oak while introducing meaningful advancements.

Case and Materials

The case is crafted in robust stainless steel, featuring the Royal Oak’s signature octagonal bezel with eight hexagonal screws. The finishing blends brushed surfaces with polished chamfers, reflecting the artisanal mastery of Audemars Piguet. Measuring 41 mm in diameter and just 9.5 mm in thickness, the watch is slim for a perpetual calendar, ensuring elegance and comfort on the wrist.

Thanks to a new crown-based setting system, the case design has been refined by removing the traditional recessed pushers, allowing for a cleaner silhouette and improved water resistance of 50 meters—a significant upgrade from earlier generations.

Dial and Display

The timepiece features a stunning blue “Grande Tapisserie” dial, a hallmark of the Royal Oak collection. The subdials are rendered in a matching tone-on-tone design, including indicators for the day, date, month, moonphase, and leap year. The inner bezel displays the ISO week numbers, adding utility to the calendar function.

White gold applied hour markers and Royal Oak hands are filled with luminescent coating to ensure optimal readability in all lighting conditions. The deep blue hue of the dial shifts subtly under light, enhancing its sophistication and visual depth.

Movement and Innovation

At the heart of this reference lies the newly introduced Calibre 7138, a selfwinding movement based on the high-performance architecture of the Calibre 7121. This mechanism offers a frequency of 4 Hz (28,800 vph) and a power reserve of approximately 55 hours.

What truly sets Calibre 7138 apart is its innovative crown-controlled perpetual calendar adjustment system, eliminating the need for recessed correctors and enhancing usability. This intuitive functionality is protected by three new patents, offering a more seamless ownership experience while safeguarding the mechanism against accidental mishandling.

Technical Specifications

• Reference: 26674ST.OO.1320ST.01
• Case: Stainless steel, 41 mm diameter, 9.5 mm thickness
• Water Resistance: 50 meters
• Dial: Blue “Grande Tapisserie” with matching subdials
• Movement: Calibre 7138, automatic, 4 Hz, 55-hour power reserve
• Functions: Perpetual calendar with day, date, month, week number, moonphase, leap year
• Bracelet: Stainless steel with AP folding clasp

Conclusion 26674ST.OO.1320ST.01

The Audemars Piguet Royal Oak Perpetual Calendar Ref. 26674ST.OO.1320ST.01 combines iconic design with modern horological innovation. Its upgraded movement, refined case architecture, and intuitive perpetual calendar interface place it at the forefront of modern luxury watchmaking. For collectors and enthusiasts alike, it delivers technical mastery, usability, and timeless Royal Oak appeal in one remarkable package.