The Audemars Piguet Royal Oak skeleton, which AP calls the Royal Oak Openworked, is a Royal Oak with the dial plate cut away so the movement's bridges, wheels and balance can be seen from the front. It comes in 37, 39 and 41 mm sizes and in steel, gold, sand gold, ceramic and gem-set versions, and it ranges from a simple openworked automatic to double balance wheel and higher-complication movements. This guide explains what openworked means, how the main references differ, which size and material suit which wrist, how the dial affects legibility and ownership, dated catalogue price context and what to check before buying. Bizak & Co. sources these watches to order; the Royal Oak collection shows the references we can seek.
Last reviewed on September 29, 2026 by Filip Biczak. Prices are dated observations, not quotes.
What is the difference between a skeleton and an openworked Royal Oak?
In everyday use the words are interchangeable, and collectors search for "Royal Oak skeleton" more often than for the maker's term. Technically a skeleton movement is one whose plates and bridges have been cut away to leave a lattice, while "openworked" is Audemars Piguet's word for a watch whose dial and movement have been opened so the mechanism forms the dial. On a Royal Oak the tapisserie dial is replaced by the movement itself, framed by the octagonal bezel and the eight hexagonal screws that define the model since its 1972 launch, when Gerald Genta's design appeared in steel as the reference 5402.
Two practical points follow. First, an openworked Royal Oak is a different object from a standard Royal Oak with an exhibition case back: the entire dial side is the display. Second, because the movement must look good from the front, the finishing is applied where the eye lands, with bevelled bridge edges, polished angles and decorated surfaces rather than only on the hidden side of the plates.
Which Royal Oak openworked references exist?
AP has produced openworked Royal Oaks in several families, so the reference number matters more than the word skeleton. The table lists entries in Bizak's sourced catalogue as listed on September 29, 2026, all sourced to order. The asks depend on year, condition and papers and are not retail figures.
| Reference | Size and material | Catalogue listing, Sep 29, 2026 |
|---|---|---|
| 15467OR.OO.1256OR.01 | 37 mm rose gold, double balance wheel | US$157,500 |
| 16204BA.OO.1240BA.01 | 39 mm yellow gold | US$195,700 |
| 26735ST.OO.1320ST.02 | 41 mm stainless steel | US$286,803 |
| 15416CE.OO.1225CE.01 | 41 mm black ceramic, double balance wheel | US$319,300 |
| 26735SG.OO.1320SG.01 | 41 mm sand gold | US$557,750 |
| 15469BC.ZZ.1260BC.01 | 37 mm white gold with diamonds | US$929,999 |
Read the table as a spread of materials and configurations rather than a ranking. Precious metal and gem-setting raise the price in the obvious way; the double balance wheel and higher-complication movements add another layer. The steel 41 mm sits between the gold and ceramic entries because the movement, not only the case, sets its price. For a close look at one of them, see our guide to the Royal Oak 15416CE in black ceramic.
Source: the Audemars Piguet watch collection lists the maker's current Royal Oak references and their specifications.
Which size is right: 37, 39 or 41 mm?
- 37 mm. The smallest current openworked size, comfortable on wrists under about 16 cm (6.3 inches) and a common choice for gold and gem-set versions. The dial has less room, so the movement looks denser.
- 39 mm. The size of the original 1972 Royal Oak and the one most collectors call the classic proportion. Extra-thin references in this size wear slimmer than the 41 mm watches.
- 41 mm. The modern standard for the collection, with the most dial area for the movement to show. It has more wrist presence and suits wrists from roughly 16.5 cm (6.5 inches) upward.
Lug-to-lug length and thickness matter as much as diameter in an integrated-bracelet watch. Try the watch on a wrist that matches yours, or ask for both dimensions and compare them with a watch you already wear.
Steel, gold, sand gold or ceramic?
| Material | Look and wear | Watch out for |
|---|---|---|
| Stainless steel | Cool grey, the most familiar Royal Oak; brushed and polished surfaces | Fine hairlines and polishing that rounds the bevels |
| Yellow, rose and white gold | Heavier and warmer; the bracelet feels solid and the movement's finishing looks richer | Soft metal shows knocks; over-polishing removes the bracelet's sharp transitions |
| Sand gold | A pale, champagne-toned gold alloy that reads as a distinct colour | Matching replacement links can be harder to source |
| Black ceramic | Light, uniform and scratch-resistant; a tonal, technical look | Brittle at corners; chips are replaced, not polished |
How does an openworked dial affect legibility?
Every openworked watch trades legibility for display. With no solid dial behind the hands, contrast is lower, particularly in low light and when the hands cross bridges of a similar colour. AP mitigates this with applied markers and hands finished to stand out, and on some references the bridges are coloured to separate them from the hands. Even so, expect to read the time a fraction more slowly than on a tapisserie Royal Oak. If you plan to use the watch as your only watch in an office with dim lighting, wear it for a day before deciding.
An open dial also removes the cover that hides small faults. Dust, dried oil or a scuffed bridge is visible from the front, so a used openworked watch is easier to judge honestly and harder to sell if the movement is not clean.
What does a double balance wheel add to the movement?
Two of the references above use a double balance wheel architecture: two balance wheels on a shared axis, oscillating together so that positional errors partly cancel. The intent is better rate stability across positions, and it makes the regulator itself the centrepiece of the dial. It does not change water resistance or shock protection. Whether it matters to you is a question of taste: buyers who like watching the balance work tend to want it; buyers who want the simplest openworked Royal Oak may prefer a single-balance reference.
How much is a Royal Oak skeleton in 2026?
- Retail. Retail pricing varies by market and reference, and boutiques allocate current production to established clients. Confirm current references and prices with the maker or an authorised boutique.
- Catalogue asks. On September 29, 2026 Bizak's sourced catalogue listed openworked Royal Oaks from about US$157,500 for a 37 mm rose gold reference to about US$557,750 for a 41 mm sand gold reference, with the black ceramic double balance wheel at US$319,300, all sourced to order. A gem-set 37 mm white gold reference listed near US$929,999.
- What moves it. Material, complication, year, full set and condition. A watch without box and papers should be priced well below a full-set example.
These figures describe one day and will move. Ask for a dated quote for the exact reference and documents; our Audemars Piguet price guide explains how to compare quotes.
What should you check before buying an openworked Royal Oak?
- Full reference. The digits after the dots identify the dial or setting, the bracelet and the variant; they must match the papers and the case.
- Movement through the dial. Look for even finishing, no dust or lubricant marks and bridge screws with undamaged slots.
- Case and bracelet. Sharp transitions between brushed and polished surfaces mean the watch has not been over-polished; on ceramic, inspect every corner for chips.
- Crystal. Sapphire is hard but not immune; check the bezel side for edge chips and the underside for marks.
- Service history. Ask when the movement was last serviced and by whom; AP describes its own options on its services page.
- Authenticity. Openworked dials are complicated to copy well, but counterfeit and mixed-part watches exist. Our authentication process and the Royal Oak authentication guide set out what we check.
Quick answers
What is a Royal Oak skeleton?
It is a Royal Oak whose dial has been cut away so the movement forms the dial. Audemars Piguet calls this Openworked, and it comes in 37, 39 and 41 mm sizes and several materials.
What is the difference between skeleton and openworked?
In practice the terms overlap. Skeleton is the general collector word; Openworked is AP's name for its openwork designs where the mechanism is finished to be seen from the front.
How much does an openworked Royal Oak cost?
Bizak's sourced catalogue listed openworked Royal Oaks from about US$157,500 to about US$557,750 on September 29, 2026, with a gem-set example higher, all sourced to order. Request a dated quote for a specific reference.
Is an openworked Royal Oak hard to read?
It is harder than a tapisserie dial, especially in low light, because the hands sit against a busy, low-contrast movement. Try the watch in your usual lighting before buying.
Which openworked Royal Oak is best for a first purchase?
The 41 mm steel reference is the most conventional in look and material, while the 39 mm gold and 37 mm rose gold references suit smaller wrists. Choose on size and finish before price.
Request an openworked Royal Oak sourcing quote
Tell us the size, material, complication preference, year range and whether the full set is required, plus your budget and timing, through our sourcing enquiry form. We confirm the specific watch, photographs, papers and final price before you commit. Catalogue entries: 26735ST steel, 16204BA yellow gold and 15467OR rose gold; browse the Royal Oak collection and the Audemars Piguet collection, or sell or trade your watch.
Related reading: Royal Oak 15416CE guide · Audemars Piguet watch prices · Royal Oak authentication guide · Watch nicknames explained.
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