Hands on review of the Audemars Piguet Automatic Perpetual Calendar Ultra-Thin 26586IP

We could guess it, the prototype RD#2 presented during the SIHH 2018 was not going to remain without continuation and it is in all logic that the final and marketed version was presented a year later. It was certainly not a small matter because there is always a big difference between the creation of prototypes and the homogeneous production of a certain number of  pieces especially when the watch we are talking about is the thinnest automatic perpetual calendar in the world . In any case, as long as the watch remained in the prototype state, there remained an unfinished taste. For me, a record can only be validated if the watch is marketed and available to end customers. Otherwise, we stay in the concept area. The mission is accomplished for Audemars Piguet. The Royal Oak Automatic Perpetual Calendar  Ultra-Thin 26586IP has been delivered to its customers for several weeks and is as impressive as the prototype from which it arises.


In fact, this watch is very convincing because it is part of a logic. The purpose of the Royal Oak, as it was imagined by Gérald Genta, is to be an elegant, fine and slender watch. And besides, the Royal Oak Perpetual Calendar which were subsequently unveiled were also in this same aesthetic approach. The context was favorable and the quest for the  thinness record made sense with such a watch. It was still necessary to achieve this. We all know that every tenth of a millimeter gained inside a mechanical movement is a feat. It is necessary to optimize all the elements, mobile or not: wheels, pinions, bridges but very quickly the constraints appear: minimum heights are required for the movement to operate with reliability and performance.

This is the reason why Audemars Piguet went further than this pure optimization by changing the architecture of the movement which offers a more rational and integrated structure. The caliber 5133 that powers the Royal Oak  Automatic Perpetual Calendar Ultra-Thin has a thickness of 2.89mm, which is a significant performance given the winding system and the complication. Imagine the prowess: the thickness of the case is 6.3mm what is more than 3mm gained compared to a traditional Royal Oak Perpetual Calendar. This was achieved by combining the perpetual calendar functions on one plane instead of the usual three levels. Two patents testify to this better integration: the integration of the end-of-month cam with the date wheel and the association of the month cam with the month wheel.


What is remarkable with this watch is that the result has been achieved without compromise from a practical point of view. The crown is handled like a normal crown. The traditional functions of the Audemars Piguet perpetual calendar are indeed present with, however, a different organization of the dial: the moon phases are at the top of the dial (usually at its base) and the dates are at 6 o'clock instead of 3 o'clock what I prefer: I find it easier to read them. Note that the leap year display is next to the month sub-dial instead of being inside and the presence of a very practical day & night indicator for the secure setting of the perpetual calendar functions. But above all, the displays have been enlarged, which significantly improves the readability, especially at the level of the dates, which remains the most important display.


If the reference 26586IP is the production version of the prototype RD#2, it is not however its clone. Two distinctive elements should be emphasized: the disappearance of the "Grande Tapisserie" pattern replaced by a satin blue finish with the most beautiful effect and the use of a titanium case which replaces the platinum case. The platinum bezel is however preserved. In fact, the final watch is lighter than the prototype: lighter in terms of weight but also visually speaking. The removal of the pattern from the dial finally gives a more contemporary appearance and favors the enlargement of the displays.

I must admit that I have a mixed feeling about the alliance between titanium and platinum. I understand the interest of combining two neutral color materials and which have different renderings. This gives a lot of subtlety and depending on the light conditions the contrasts can be strong. On the other hand, using a platinum bezel doesn't seem to me to be the best idea for a Royal Oak: the material gets scratches easily and, as a paradox, is very delicate to polish. The bezel is the most exposed part. Under these conditions, I would have preferred a case entirely made of titanium.


One thing is certain: from an aesthetic point of view, the Royal Oak Perpetual Calendar Automatic ltra-Thin is a real success. It is elegant, refined, contemporary. And above all, despite its slender style (a diameter of 41mm for a thickness of 6.3mm), it retains a very beautiful presence on the wrist. The quality of the finishes, the typical design of the Royal Oak, the way it plays with the light (the satin aspect of the dial, the alternation of the polished and satin parts), the realistic rendering of the moon contribute to this presence and to the incomparable charm of the watch.

The back of the case also offers a very nice show. We are not disoriented since the 5133 movement was developed from a caliber 2120 which indicates that most of the work was concentrated on the specific perpetual calendar module. The consequence is that we find the performance linked to the basic engine, namely a frequency of 2.75hz and a power reserve, unfortunately too short, of 40 hours. The presentation of the movement is very neat while avoiding unnecessary spectacular effects. Audemars Piguet favored monochrome decoration and this is an excellent idea, consistent with the design of the watch. I really liked the rendering of the movement and its larger diameter is more aesthetic.


Audemars Piguet has therefore undoubtedly struck a blow with this Royal Oak. The thinness record is above all part of an aesthetic approach and the result is magnificent. The watch exudes an atmosphere that is both technical and elegant and depicts in a certain way the future ambition of the manufacture. The work carried out on the movement provides proof of all its capacity for development and improvement of the existing. The reference 26586IP is extremely innovative but it doesn't forget the roots and fundamentals of the brand. It is an aesthetic extension of the other Royal Oak Perpetual Calendar while offering small stylistic evolutions that make sense. Once put on the wrist, the reference 26586IP surprises with its comfort, its slender style and above all its readability. If I had to put under the spotlight only one element, I would underline the effort made on the enlargement of the date display. Because a watch featuring a perpetual calendar complication whose dates are not legible has lost all its meaning. And we know a lot in this case. Audemars Piguet has not forgotten the practical objectives in its quest for the thinness record and that is what makes this watch so successful and so attractive. Its price is unfortunately (and logically) at the height of the peak reached: 140,000 Swiss francs excluding taxes. But I am not very worried: carried by its beauty, its technical content and the Grand Prix of the Aiguille d'Or obtained during the GPHG 2019 a few weeks ago, it will not experience any trouble to find customers. It is rather the latter who will have difficulty to get it.



+ a technical success in the service of the aesthetic approach
+ the dial lay-outand the enlarged date display
+ a refined decoration without unnecessary effect
+ the comfort on the wrist


- the platinum bezel can easily get scratches
- the power reserve, too short especially for a perpetual calendar watch


mdg December 30th, 2019-15:05
Great review... thank you. I agree about the power-reserve and the bezel. I am guessing (I hope) that the bezel may be replaced during service. Not cheap but at this price point I doubt owners would be too worried. Although I don't see any reason why the bezel cannot be ... 
amanico December 30th, 2019-15:14
An outstanding watch. The ultra thin case adds a lot of elegance to this watch.  
Ted-Lo December 30th, 2019-15:24
I am waiting for the day to blow my rainy day savings... On a full ceramic 15202!!!! 40 year wait list?
Spangles - Mr. Tabby December 31st, 2019-11:19
I sense a new ad campaign: You never really buy an AP, You merely get on the waiting list so your children can! :P
Ted-Lo December 31st, 2019-11:30
LOL - phenomenal! Let’s see how Patek responds to that!
HighEndOne December 31st, 2019-14:15
Wow... That is funny...  
MTR December 30th, 2019-15:36
A warm thank you for this great review! The calmed dial is mesmerizing and practical (= legible), too. I have been searching for the „right“ PC for quite a period now and not many dials have proven to be really legible which always stops my first enthusiasm. For me the PR of 40 hours isn‘t a bi... 
M4 December 30th, 2019-16:00
A very beautiful timepiece. I must admit it is an object of lust even if I'm normally not inclined toward perpetual calendar watches or blue dials. This one, however, brings the bell. Thank you for the review. M4
mdg December 30th, 2019-16:44
P.S. The movement seems a tad small from the photo, but just think what they could do with this in a time-only dress watch : )
Mikesr  December 30th, 2019-19:50
 I want one.

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