Audemars Piguet Royal Oak Perpetual Calendar Openworked with New Calibre 7139 - 2026
Audemars Piguet Unveils Revolutionary Royal Oak Perpetual Calendar Openworked with Calibre 7139
Audemars Piguet has announced a significant generational upgrade to the Royal Oak Selfwinding Perpetual Calendar Openworked, featuring the all-new Calibre 7139 movement. Released on February 6, 2026, this 41mm titanium and BMG timepiece represents a confident step forward for one of the Royal Oak's most demanding complications, combining technical innovation with refined aesthetics.
Revolutionary Crown-Only Adjustment System
According to Monochrome Watches, the standout feature of the new Calibre 7139 is its all-in-one crown system for adjusting all perpetual calendar functions. Unlike traditional perpetual calendars requiring tools and recessed correctors, the 26685XT allows complete calendar adjustment through a single crown—no tools needed. This patent-pending system fundamentally changes the user experience, turning what was often a fragile ritual into something reassuringly simple.
Technical Specifications
| Specification | Details |
|---|---|
| Case Diameter | 41mm |
| Case Thickness | 9.5mm |
| Water Resistance | 50 meters |
| Movement | Calibre 7139 (in-house selfwinding openworked perpetual calendar) |
| Movement Thickness | 4.1mm |
| Power Reserve | 55 hours minimum |
| Frequency | 28,800 vph (4Hz) |
| Components | 423 parts, 41 jewels |
| Reference | 26685XT.OO.1320XT.01 |
| Price | CHF 180,200 (excluding taxes) |
Advanced Materials: Titanium and BMG
The case combines lightweight titanium with AP's proprietary Bulk Metallic Glass (BMG), a palladium-based amorphous alloy used for the bezel, caseback frame, and bracelet studs. The satin-brushed titanium contrasts with mirror-polished BMG surfaces that exhibit a liquid-like glow. This combination delivers both precious aesthetics and technical performance while maintaining a slim 9.5mm profile.
Openworked Dial and Legibility
The sapphire openworked dial exposes the Calibre 7139 while maintaining surprisingly good legibility. The layout follows a European calendar order: day at 9 o'clock with 24-hour indicator, date at 12, month and leap year at 3, and astronomical moon phase at 6. Pink gold Royal Oak hands with luminescent material ensure readability in various lighting conditions.
Market Impact and Availability
The Royal Oak Perpetual Calendar Openworked 26685XT is available exclusively through Audemars Piguet boutiques with highly limited production. This release signals AP's commitment to advancing its perpetual calendar technology while maintaining the design codes that have made the Royal Oak an icon since 1972.
Frequently Asked Questions
Q: How does the crown adjustment system work?
A: The system features four crown positions: normal winding, calendar adjustment (clockwise for date, counter-clockwise for month/leap year), full pull for time setting, and a special correction position for day and moon phase.
Q: What is BMG (Bulk Metallic Glass)?
A: BMG is a palladium-based amorphous alloy with mirror-like polish and high scratch resistance. AP uses it for bezels and caseback frames to create striking visual contrast with brushed titanium.
Q: How does this compare to the previous perpetual calendar?
A: The new model features the Calibre 7139 (4.1mm thick) versus the previous 4.5mm movement, achieving a slimmer 9.5mm case profile while adding the innovative crown-only adjustment system.
Source: According to Monochrome Watches
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