Audemars Piguet Royal Oak Dual Time 26120: Reference Explained, Dial Options and What to Check

The Audemars Piguet Royal Oak Dual Time 26120 is a 39 mm automatic Royal Oak that adds a second time zone with day and night indication, a date and a power reserve display to the classic octagonal-bezel case. It sits in the Jumbo-sized family of the Royal Oak line, and it was made in steel and gold versions with several dial colors. This guide explains the reference, the options you will see on the market and the checks that matter before you buy. Bizak & Co. is a sourcing desk: we find a specific watch to order, and nothing in this guide is a stock listing.

Last reviewed on October 28, 2026 by Filip Biczak. Specifications are compiled from collector databases and dealer write-ups rather than an Audemars Piguet catalogue, so confirm any detail against the papers of the exact watch. Sources: Grail Watch wiki, Royal Oak Dual Time and A Collected Man, Royal Oak 26120ST.

What is the Audemars Piguet Royal Oak Dual Time 26120?

It is the Royal Oak that tracks two time zones at once. The 26120 reference carries the standard hours, minutes, seconds and date, plus a second time zone with a 24-hour day and night indicator and a power reserve indicator. The case measures 39 mm, the same diameter as the better-known time-and-date Royal Oak Jumbo, but it is a little thicker because of the extra mechanism. One dealer write-up puts the thickness at about 10.3 mm, roughly 2 mm more than the 8.1 mm time-and-date Royal Oak Jumbo.

The reference is generally described as a discontinued model, with production ending around the middle of the 2010s according to one dealer source. Treat that as an approximate window, not an official date, which is why the papers and serial of any unit matter.

What are the 26120 specifications?

The table below lists the details that sources agree on. Where sources disagree, the row says so instead of picking a number.

Which dial options and sub-references exist?

The 26120 comes in a handful of material and dial combinations, each with its own full reference code. Collector databases list the steel versions with white, blue and black dials, rose gold versions with black and white dials, and a yellow gold version with a silver dial. The table groups them by material; dial pairings come from a collector database, so check the code stamped on the papers rather than relying on a listing title.

The letters after 26120 tell you the case material: ST for stainless steel, OR for rose gold and BA for yellow gold. The gold versions are listed on a leather strap with a folding clasp, while the steel versions are the ones usually discussed with the integrated bracelet. If you are comparing, our Audemars Piguet Royal Oak Dual Time 26120ST.OO.1220ST.02 catalogue entry shows the blue-dial steel reference, which we source pre-owned on request.

How does the Dual Time complication work?

A dedicated second-time-zone display shows home time on the main dial and a second zone on an auxiliary display, with a day and night indicator so you can tell whether the second zone is morning or evening. It is a practical complication for travelers and for anyone who works with a distant office. The power reserve indicator on the same dial tells you how much running time the movement has left, which helps if the watch has sat unworn. Because the mechanism is more complex than a three-hand Royal Oak, the movement benefits from regular servicing by a qualified watchmaker.

How does the 26120 differ from other 39 mm Royal Oaks?

The 26120 shares its case diameter with the time-and-date Royal Oak, so the quickest visual tell is the extra dial real estate: a second-time-zone display and a power reserve indicator that a simple Jumbo does not have. If you want to see how 39 mm sits against the other diameters, read our guide to Royal Oak sizes. If you are weighing the dual time against a simpler dress-sport Royal Oak, the Audemars Piguet Royal Oak collection shows the wider range we can source.

What should you check before buying a 26120?

• The full reference code. The suffix after 26120 tells you material and dial; make sure it matches the watch in the photographs.
• The second time zone and power reserve. Ask for confirmation that the second-zone setting, the day and night indicator and the power reserve display all work and move correctly.
• Service history. A discontinued model with a more complex movement should come with a service record, or you should budget for one.
• Case condition. Look for polishing that has softened the bevels and the edges of the octagonal bezel, since the Royal Oak finish relies on sharp transitions between brushed and polished surfaces.
• Papers, box and serial. Match the serial and reference on the watch to the documents. Our authenticity page explains what we verify.

Can you buy a 26120 through Bizak & Co.?

Yes, on a sourcing basis. Bizak & Co. does not hold watches in stock; we find a specific unit that matches your reference, dial and condition, and confirm the details and final price before you commit. A $200 deposit, credited to the price, starts the search. Browse the Audemars Piguet Royal Oak Dual Time collection to see the examples we have described, or the full Audemars Piguet range. For a sense of how the brand is valued across models, our Audemars Piguet watch price guide gives loose ranges by collection.

Quick answers

What is the Royal Oak Dual Time reference number?

The base reference is 26120, followed by material and dial codes such as ST for stainless steel, OR for rose gold and BA for yellow gold. Each combination has its own full reference.

How big is the Royal Oak Dual Time 26120?

The case is 39 mm in diameter. One dealer write-up gives the thickness as about 10.3 mm, which is thicker than a plain time-and-date 39 mm Royal Oak because of the additional mechanism.

Which movement does the 26120 use?

Most sources name the self-winding caliber 2329/2846, running at 28,800 vibrations per hour. Jewel count and power reserve figures vary between sources, so verify them against the papers for a specific watch.

Is the Royal Oak Dual Time 26120 still in production?

It is generally described as discontinued, with one dealer source placing the end of production around the middle of the 2010s. That makes pre-owned the realistic route, and condition and service history become the main points to check.

Related reading: Audemars Piguet Royal Oak Jumbo 15202 vs 16202, Royal Oak Perpetual Calendar guide and Royal Oak sizes compared.

Get your Royal Oak sourced

Tell us the model, size, dial and bracelet preference, whether you want new or pre-owned, and your budget and timing, through our sourcing enquiry form. We confirm the specific watch, photographs and final price before you commit.