Gold is the harder material to build a chiming watch in, and this reference is the one that takes that difficulty on. Rose gold is dense, and density absorbs vibration rather than carrying it, which is why traditional repeaters in precious metal are quieter than the same movement in a lighter case. The Supersonnerie architecture was developed precisely to work against that, attaching the gongs to a dedicated soundboard rather than to the mainplate and opening the case so that sound can leave it, and applying it to gold is a more demanding test of the design than applying it to titanium. The case is 42 mm with a brown Grande Tapisserie dial and an integrated rose gold bracelet. The house has built chiming watches since long before the Royal Oak existed, and the Supersonnerie is the modern continuation of that rather than a departure from it. What the architecture changes is the acoustic result, not the tradition it belongs to, which is why the reference reads as conservative despite containing a recent development.
The case is rose gold at 42 mm with a brown inner bezel, and the whole exterior including the bracelet is executed in the same metal, so nothing about the presentation signals that the watch is anything other than a Royal Oak. That understatement is deliberate. A repeater carries no external indication of what it contains beyond the slide in the case band, and on this reference the slide is the only visible difference between it and a considerably simpler watch. The dial is brown with the Grande Tapisserie pattern, the guilloche grid that has defined the collection since the beginning, and the pattern is retained here rather than replaced by a plainer surface, which is not a given on complicated Royal Oak references. Rose gold hands and hour markers sit over it, and the brown inner bezel closes the dial with a tone rather than a contrast. Retaining the Grande Tapisserie on a chiming reference is a decision with a cost. A guilloched dial is thicker and more structured than a plain one, and every element added between the movement and the crystal has some acoustic consequence, so keeping the pattern means accepting a constraint in exchange for the watch continuing to look like a Royal Oak.
The function set is a minute repeater with hours, minutes and small seconds, and nothing else. That restraint is the standing arrangement on Supersonnerie references because every additional mechanism is another component capable of absorbing or interrupting the sound. Hours, quarters and minutes are struck on demand from the slide, and the sequence itself is conventional. What is not conventional is the sustain, since the soundboard construction lets the note continue after the hammer has fallen rather than stopping with it. Regulation is done by ear rather than by measurement, as on any chiming watch, but the target here includes volume and duration alongside tone, which is a different brief from the one a traditional repeater is finished against. The strike is also experienced as an event rather than a display, since nothing happens until the slide is pushed and the sequence then takes several seconds to complete. That makes it the only complication in the collection the wearer has to stop and attend to, and it is the reason repeaters hold owners who are otherwise indifferent to complicated watches.
The titanium 26591IP carries the same movement and the same case design with a platinum bezel and a smoked burgundy dial, and the two references exist as a deliberate pair rather than as alternatives. Titanium is the acoustically favourable material and gold is not, so the two watches sound different and are meant to. Which is preferable depends on what the buyer wants from a repeater, since a lighter, brighter note is not automatically better than a warmer and more contained one. Elsewhere in the collection the 26605CE combines a repeater with a perpetual calendar and a split-seconds chronograph in ceramic, a substantially more complicated watch. This reference and its titanium counterpart are the only two Royal Oak references where chiming is the entire proposition. Offering the same movement in two materials that produce different results, rather than standardising on the acoustically superior one, is an unusually candid position. It leaves the choice with the buyer instead of resolving it on their behalf.
This is the version for a collector who wants a repeater that looks like a Royal Oak rather than one that looks like an experiment. Titanium announces a technical intention on the wrist, while rose gold gives no indication at all, and there are buyers for whom a complication that hides completely is the more appealing proposition. The Grande Tapisserie dial supports that reading by keeping the watch visually identical to the simplest references in the collection. What the owner gets is a watch that behaves as an ordinary gold Royal Oak until the slide is used. That contrast between appearance and content is the argument for the reference, and it is a different argument from the one the titanium version makes. Anyone considering this reference should hear both versions rather than choosing from specifications, since the difference between them is the entire question and cannot be conveyed in writing. It is also worth hearing them in a quiet room rather than a showroom, because ambient noise flatters the louder of the two and disguises what the other one does well. Weight is the other consideration and it works against this version, since a full gold bracelet at 42 mm is a substantial thing to wear all day and the titanium reference is markedly lighter.
