Audemars Piguet Royal Oak Perpetual Calendar in Bleu Nuit Ceramic
The reference 26674CD is the Audemars Piguet Royal Oak Selfwinding Perpetual Calendar done in AP's Bleu Nuit Nuage 50 ceramic, with a matching blue ceramic bracelet and a blue Grande Tapisserie dial. AP already makes a brighter blue ceramic version, and that is a fantastic watch, but the tone there reads more electric and a little more playful. This one goes the other way. The blue is deeper, darker, and more serious, and that shift is the whole point. As we said in the video, this is the blue ceramic QP a lot of collectors have been waiting for. It pairs one of the most important modern AP complications with the brand's hardest material to finish, in a case that still wears like a proper Royal Oak.
The Royal Oak Selfwinding Perpetual Calendar 26674CD in Bleu Nuit Nuage 50 ceramic, with the reference and key specs at a glance.
Table of Contents
A Darker, More Serious Blue Ceramic
The case is 41 mm of blue ceramic. AP lists the thickness at 9.5 mm, and our own measurement came in around 10 mm, with a lug-to-lug close to 50 mm. On the wrist, that is the balancing act AP keeps pulling off with these ceramic QPs. You get a high complication with real wrist presence, but the proportions stay refined enough to slide under a cuff. It never reads as bulky or clunky. It looks and feels like a major Royal Oak while wearing slimmer than you would expect.
The dial is a blue Grande Tapisserie with white gold hands and hour markers. There is a lot of information on it, since the full perpetual calendar layout is all here, but the single darker blue tone keeps it balanced and clean. That restraint is what separates this from the brighter version.
The blue Grande Tapisserie dial carries the full perpetual calendar with white gold hands and markers.
Close on the day, date, and month registers over the Grande Tapisserie guilloche.
The 41 mm ceramic case on a 7-inch wrist, wearing flatter than the complication suggests.
The deeper Bleu Nuit tone reads dressier and more serious than the brighter blue ceramic.
The Perpetual Calendar, Adjusted Through the Crown
A perpetual calendar, or QP, tracks the day, date, month, leap year, moon phase, and week indication, and it accounts for months of different lengths on its own. As long as the watch keeps running, it knows whether the month has 28, 30, or 31 days. It is one of the classic high complications in watchmaking.
Look at the side of the case and you will notice something missing. There are no correctors. The entire calendar is set through the crown. AP says this is the first time it has used this all-in-one crown adjustment system in a full ceramic case and bracelet Royal Oak Perpetual Calendar. Clearing the pushers off the case is a real change. It makes a complicated watch simpler to live with and cleaner to look at.
The case flank carries no correctors. The entire calendar sets through the crown.
Side profile of the ceramic case, kept under 10 mm thick.
Caliber 7138 and the Slim Case
Inside is the AP caliber 7138, an automatic movement with a 55-hour power reserve. The movement is only 4.1 mm thick, and that is a big reason AP can keep the whole watch under 10 mm. The headline here is not just that it is a perpetual calendar. It is that AP made the complication easier to use, cleaner on the case, and still slim enough to wear like a normal Royal Oak.
The caliber 7138 through the sapphire caseback, with its rose gold rotor.
Macro of the rose gold winding rotor and movement bridges.
Measured case thickness reads about 9.8 mm against AP's 9.5 mm listing.
Finishing Ceramic Like a Royal Oak
The watch comes on a full Bleu Nuit Nuage 50 ceramic bracelet with a titanium folding clasp. On finishing, we don't think anyone does ceramic Royal Oaks the way AP does. The Royal Oak is already one of the hardest cases and bracelets to finish, with all the brushing, polishing, sharp bevels, and hard angles. Doing that in ceramic is another level, because ceramic is extremely hard and very unforgiving to work.
That is what makes the AP ceramic special. It is not just that they made a watch in ceramic. It is that they finished it like any other Royal Oak, which is why these pieces look different from most ceramic watches on the market.
Polished bevels meeting brushed surfaces on the blue ceramic case.
The blue ceramic bracelet and AP-signed clasp on the wrist.
The titanium folding clasp on the underside of the ceramic bracelet.
Specifications
Lug-to-lug measures about 49.6 mm.
| Reference | 26674CD.OO.1225CD.01 |
| Case | 41 mm Bleu Nuit Nuage 50 ceramic |
| Thickness | 9.5 mm listed by AP, around 10 mm measured |
| Lug-to-lug | Approximately 50 mm |
| Dial | Blue Grande Tapisserie, white gold hands and markers |
| Complication | Selfwinding perpetual calendar: day, date, month, leap year, moon phase, week |
| Calendar adjustment | Crown only, no case pushers |
| Movement | AP caliber 7138, automatic, 4.1 mm thick |
| Power reserve | 55 hours |
| Bracelet | Blue ceramic with titanium folding clasp |
| Price | $485,000 |
Frequently Asked Questions
How much is the Audemars Piguet Royal Oak Perpetual Calendar 26674CD?
We have the Bleu Nuit ceramic 26674CD listed at $485,000. That puts it among AP's higher complications, which fits a full ceramic perpetual calendar on a matching ceramic bracelet. If you want current availability or to talk through the piece, reach out to us directly.
How is the Bleu Nuit version different from the other blue ceramic Royal Oak?
It comes down to tone. The other blue ceramic Royal Oak is brighter and more electric, which reads a little more playful. The Bleu Nuit Nuage 50 is deeper and darker, so it feels more serious and collector-focused while keeping the same Grande Tapisserie dial layout.
Does the 26674CD have calendar pushers?
No. There are no correctors on the case. The entire perpetual calendar is set through the crown. AP says this is the first time it has used this all-in-one crown adjustment system in a full ceramic case and bracelet Royal Oak Perpetual Calendar, which keeps the case cleaner.
How thick is the watch?
AP lists the case at 9.5 mm, and our own measurement came in around 10 mm, with a lug-to-lug close to 50 mm. The caliber 7138 is only 4.1 mm thick, which is the main reason AP can keep a full perpetual calendar under 10 mm on the wrist.
What movement is inside?
The AP caliber 7138, an automatic perpetual calendar movement with a 55-hour power reserve. At 4.1 mm thick, it lets AP keep the watch slim while running the day, date, month, leap year, moon phase, and week indication, all adjusted from the crown.