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Royal Oak
Royal Oak
Perpetual Calendar
Ref. 26674ST.OO.1320ST.01
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Serial no.
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Documentation
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Warranty
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Welcoming Calibre 7138 to the Royal Oak collection, this refined stainless steel reference features an elegant tone-on-tone blue dial offering optimal legibility of the perpetual calendar functions. The Manufacture's new cutting-edge movement features three patented mechanisms and is adjusted solely with the crown, removing the need for additional tools.
Discover the new Royal Oak Perpetual Calendar overall silhouette into full view. Beyond its intricate architecture and refined finishes, explore its enhanced dial redibility and revolutionary ergonomics.
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Case
The 41 mm case is crafted in stainless steel and features a glareproofed sapphire crystal and caseback. The timepiece is water resistant to 50 m.
- Size 41 mm
- Thickness 9.5 mm
- Water Resistance 50 m
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Dial
The blue "Grande Tapisserie" dial with tone-on-tone subdials and a matching inner bezel is fitted with 18-carat white gold hour-markers and hands filled with luminescent material.
Bracelet
The integrated stainless steel bracelet is fitted with an AP folding clasp.
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Setting
Building on its heritage and past developments while looking to the future, Audemars Piguet has reimagined the perpetual calendar mechanism with ergonomics in mind.
To enhance user’s experience and streamline the design of the case, AP’s engineers have created an easier and more intuitive correction system entirely controlled via the crown, to make this high complication adjustable anywhere without tools and without risk of damage.
A new ergonomic perpetual calendar
Audemars Piguet has rethought the perpetual calendar, which mechanically reproduces the movement of the celestial bodies, with ergonomics at its heart to adapt to evolving lifestyles and open up new technical and design avenues.
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Revolutionary Ergonomics featuring Caliber 7138
As part of our perpetual calendar launch in 2025, Nicolas Ponsot from our R&D team tells us about the challenges of balancing performance, ergonomics and aesthetics in the design of our new perpetual calendar movement, Calibre 7138.
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Our 150th Anniversary Website
How much do you know about Astronomy ? Discover our Astronomical Observatory and unveil the secrets of time.
Visit the House of Wonders
Astronomy, the mother of watchmaking
Drawing their inspiration from the clear night skies of the Vallée de Joux, generations of Audemars Piguet watchmakers have crafted prestigious timepieces capturing the astronomical cycles of days, months, years and the phases of the moon.
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Unveiling the secrets of astronomy
The first complication adopted by the Royal Oak was the calendar. Between 1983 and 1984, the famous octagonal watch was successively enriched with Day-Date, moon phase and perpetual calendar functions.
Read on AP ChroniclesCase
- Material Stainless steel
- Water Resistance 50 m
- Size 41 mm
Dial
The blue "Grande Tapisserie" dial with tone-on-tone subdials and a matching inner bezel is fitted with 18-carat white gold hour-markers and hands filled with luminescent material.
Bracelet
The integrated stainless steel bracelet is fitted with an AP folding clasp.
Calibre 7138
- Functions Perpetual calendar with week indication, day, date, astronomical moon, month, leap year, hours and minutes.
- Number of jewels 41
- Mechanism Selfwinding
- Power reserve 55 h
- Total diameter {{ 29.6 || localMillimeterNumber}} mm
- Number of parts 423
- Frequency 4 hz {{ 28800 || localVibrationNumber}} vph
- Thickness 4.1 mm
Warranty
Two year warranty
Your watch is guaranteed against manufacturing defects for a period of 2 years subject to our International Sales Warranty.
Five year warranty
Applicable to all AP watches purchased through our authorized network from 1st January 2017 subject to our International Sales Warranty.
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