- 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
18-carat sand gold, 41 mm
The Audemars Piguet Royal Oak Perpetual Calendar, reference 26674SG.OO.1320SG.01, in 18-carat sand gold, 41 mm across. Selfwinding Calibre 7138, a perpetual calendar with astronomical moon and week indication, adjusted entirely through the crown.
The Audemars Piguet Royal Oak Perpetual Calendar, reference 26674SG.OO.1320SG.01, is cased in 18-carat sand gold, 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 sand gold-toned with the "Grande Tapisserie" pattern, a matching inner bezel, tone-on-tone subdials with black indicators, and 18-carat white gold hour-markers and hands filled with luminescent material. The bracelet is an integrated design, entirely in 18-carat sand gold, on an AP folding clasp.
The movement is Calibre 7138, a new selfwinding perpetual calendar introduced by Audemars Piguet in 2025, giving week indication, day, date, astronomical moon, month, leap year, hours and minutes. Its calendar functions are adjusted entirely through the crown, using three patented mechanisms that remove the need for additional correction tools. 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
This reference received the 2025 Grand Prix d'Horlogerie de Genève's award, as Audemars Piguet states; HYPA does not repeat the award's own category name, since it contains a word excluded by our editorial style.
Key details
Design and engineering
- Case18-carat sand gold, 41 mm across and 9.5 mm high. Glareproofed sapphire crystal and caseback; water resistance rated to 50 m.
- DialSand gold-toned with the "Grande Tapisserie" pattern, a matching inner bezel, tone-on-tone subdials with black indicators, and 18-carat white gold hour-markers and hands filled with luminescent material.
- BraceletIntegrated, entirely in 18-carat sand gold, 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 | 26674SG.OO.1320SG.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 | 18-carat sand gold |
Buying with HYPA
Purchase with confidence
- Original warranty card included, dated 2026
- Free insured delivery within Australia · international 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 · 6 reviewsFrom clients of HYPA International on Google. Read the reviews
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