- Year
- 2026
- Condition
- Unworn
- Set
- Box and papers
- Size
- 41 mm
Set and condition
Complete set
This Royal Oak Perpetual Calendar is accompanied by its original presentation box, warranty card and supporting documentation. The watch and included items are inspected by an expert watchmaker before sale. Additional photographs and video of this piece are available on request.
Original presentation box
Original presentation box and packaging.
Original papers
Warranty card and supporting documentation.
Inspected prior to sale
Reviewed for condition, completeness and functionality. Additional details and photographs are available on request.
Condition photography
Additional close-up images of specific areas are available before purchase.
Overview
Stainless steel, 41 mm
The Audemars Piguet Royal Oak Perpetual Calendar, reference 26674ST.OO.1320ST.01, in stainless steel, 41 mm across, with a blue "Grande Tapisserie" dial. Selfwinding Calibre 7138, a perpetual calendar with astronomical moon, month and leap year, correctable entirely via the crown.
The Audemars Piguet Royal Oak Perpetual Calendar, reference 26674ST.OO.1320ST.01, is cased in stainless steel, 41 mm across and 9.5 mm high, with a glareproofed sapphire crystal and caseback. Water resistance is rated to 50 m. The dial is blue, with the "Grande Tapisserie" pattern, tone-on-tone subdials and a matching inner bezel, 18-carat white gold hour-markers and hands filled with luminescent material. The bracelet is integrated stainless steel, on an AP folding clasp.
The movement is Calibre 7138, a selfwinding calibre giving a perpetual calendar with week indication, day, date, astronomical moon, month, leap year, hours and minutes. It is 29.6 mm across and 4.1 mm high, built from 420 parts holding 41 jewels, and runs at 4 Hz (28,800 vph) with a power reserve of 55 hours.
For collectors
Audemars Piguet describes Calibre 7138 as Audemars Piguet's newly introduced perpetual calendar movement, adjustable entirely from the crown without additional tools, and built around three patented mechanisms.
Key details
Design and engineering
- CaseStainless steel, 41 mm across and 9.5 mm high, with a glareproofed sapphire crystal and caseback. Water resistance is rated to 50 m.
- DialBlue, with the "Grande Tapisserie" pattern, tone-on-tone subdials and a matching inner bezel, 18-carat white gold hour-markers and hands filled with luminescent material.
- BraceletIntegrated stainless steel, on an AP folding clasp.
Calibre 7138
- Selfwinding
- Perpetual calendar with week indication, day, date, astronomical moon, month, leap year, hours and minutes
- 29.6 mm across, 4.1 mm high; 420 parts, 41 jewels
- 4 Hz (28,800 vph)
- Power reserve 55 h
The reference
Technical specifications
| Reference | 26674ST.OO.1320ST.01 |
|---|---|
| Collection | Royal Oak |
| Calibre | Calibre 7138 |
| Functions | Perpetual calendar with week indication, day, date, astronomical moon, month, leap year, hours and minutes. |
| Case dimensions | 41 mm |
| Case material | Stainless steel |
| Bracelet | Stainless steel, AP folding clasp |
Buying with HYPA
Purchase with confidence
- Original warranty card included, dated 2026
- Free insured delivery within Australia and Hong Kong · elsewhere quoted
- Payment by bank transfer
- Registered Australian dealerHYPA International Pty Ltd · Registered Victorian second-hand dealer, Registration No. SHD-0018017.
- Direct specialist supportSpeak with the HYPA team before, during and after the purchase.
- Rated 5.0 on Google · 11 reviewsFrom clients of HYPA International on Google. Read the reviews
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