This is the rose gold perpetual calendar, and it goes further with the aventurine than its white gold sibling does. On that reference the aventurine is the main dial and the subdials are conventional; here the subdials are aventurine as well, so the material runs continuously across the entire face and the calendar registers are cut into the same night-sky surface rather than sitting on top of it. That is a harder execution and a considerably more coherent result, because a perpetual calendar with contrasting subdials always reads as a dial with things placed on it, and this one reads as a single object with information emerging from it. The case is rose gold at 41 mm across and 10.9 mm thick, and it is no longer part of the current collection.
The case measures 41 mm across and 10.9 mm thick in rose gold, which is worth pausing on, because a perpetual calendar carrying six indications in a case under eleven millimetres is genuinely slim and thinner than the flyback chronographs in this same collection. It means the reference sits flat and goes under a cuff, which almost nothing carrying this complication manages. The bezel is rose gold and matches the case, so the metal runs continuously from the crystal out to the lugs. Rose gold against blue aventurine is the warm and cool pairing rather than the uniform one its white gold sibling offers, and it changes the material completely: against warm metal the aventurine reads bluer and more saturated, where against white gold it stays closer to grey. The dial and subdials are blue aventurine, glass with metallic particles suspended through it at varying depths, so the surface is not a colour but a material and shifts from near-black in shadow to a field of scattered light under direct illumination. Using it for the subdials as well as the main dial is the risk this reference takes, since a calendar needs every register readable and an iridescent surface is the hardest possible ground to read against. The applied hour markers and hands are rose gold, warm against the blue and the elements that keep the time itself findable on a dial doing a great deal else. The inner bezel is lacquered blue, framing the aventurine without introducing a second material. The strap is blue rubber-coated with a rose gold pin buckle matching the case. The buckle rather than the folding clasp used on the white gold version is the one specification where the two references diverge outside of metal and dial, and it changes how the watch is handled rather than how it looks. A pin buckle keeps height off the underside of a slim case; a folding clasp keeps the strap in a closed loop, which matters on a calendar its owner is motivated never to let stop. Neither is obviously the better answer, and it is worth knowing which is fitted before rather than after.
The function set is a perpetual calendar with week indication, day, date, astronomical moon, month, leap year, hours and minutes. A perpetual calendar accounts for the length of every month including February and for leap years, so it requires no correction at all provided the watch keeps running, which is both the point of the complication and its principal demand. The astronomical moon is the more accurate form of the moon phase, calculated against the real lunar cycle rather than a simplified approximation, so its drift is negligible across a period measured in lifetimes. The week indication is what separates this reference from a conventional perpetual calendar, running the week of the year around the outermost ring, which is the only space a calendar of this density leaves available. The cost is the one every perpetual calendar carries. Let the watch stop and resetting it is a careful, lengthy procedure rather than a quick one, and with a week indication there is more to reset than usual.
Within Audemars Piguet's structure Code 11.59 was introduced as a third pillar alongside the Royal Oak and the Offshore and is the only one not built around an octagonal bezel and an integrated bracelet. Within the line the 26394 perpetual calendars sit at the top of the collection, above the 26393 chronographs and well above the 15210 selfwinding models, and they are the references that establish Code 11.59 as a genuine complication platform rather than a design exercise. Its direct sibling is the white gold version, which uses aventurine only for the main dial and reads cooler and more restrained. The two together demonstrate how far a case metal and one additional material decision can separate watches that are otherwise identical.
This reference is for a collector who wants the most complete calendar made and wants it warm rather than cool. Rose gold with blue aventurine is an assertive combination and considerably less discreet than the white gold version, which reads as steel until it is handled. The full aventurine treatment across the subdials is the detail that justifies the reference over its sibling, and it is also the one that cannot be photographed, since images flatten aventurine into an ordinary blue and lose everything that makes it worth having. Now that the reference has left the catalogue the production is closed, and perpetual calendars are made in far smaller numbers than anything else in the collection. The buyer is someone who wants a calendar they will never correct and a dial they will keep looking at.
