The Patek Philippe Nautilus and the Audemars Piguet Royal Oak are two integrated-bracelet steel sports watches drawn by the same designer, Gérald Genta, and the better choice depends mostly on what you want from the wrist: pick the Royal Oak for a bolder, more angular statement and easier access, and the Nautilus for a softer, quieter shape with a harder chase. Neither is objectively superior. This guide compares them at model level so you can decide before you commit to a search. Bizak & Co. is a sourcing desk, so every watch mentioned here is sourced to order rather than held in stock.
Last reviewed on October 28, 2026 by Filip Biczak. Specifications are summarized from manufacturer and reputable reference material, vary by reference and year, and should be confirmed against the papers of the exact watch.
What is the difference between the Nautilus and the Royal Oak?
The Royal Oak has an octagonal bezel held by exposed hexagonal screws, while the Nautilus has a rounded-octagon bezel with hinged "ears" that suggest a porthole. Audemars Piguet introduced the Royal Oak in 1972, and Patek Philippe followed with the Nautilus in 1976. Both pair a steel case with a bracelet that flows out of the case, and both carry a textured dial. The Royal Oak reads as sharper and more industrial; the Nautilus reads as smoother and more understated.
| Attribute | Patek Philippe Nautilus 5711/1A | Audemars Piguet Royal Oak 15500ST |
|---|---|---|
| Launched (original model) | 1976 | 1972 |
| Designer | Gérald Genta | Gérald Genta |
| Case | 40 mm steel | 41 mm steel |
| Bezel | Rounded octagon with hinged sides | Octagonal with eight exposed screws |
| Movement | Caliber 324 S C to 2019, then 26-330 S C, automatic | Caliber 4302, automatic |
| Power reserve | 35 to 45 hours | About 70 hours |
| Water resistance | 120 m (12 bar) | 50 m |
| Status | Steel 5711 discontinued in 2021 | 15500 introduced in 2019, since succeeded by newer references |
Who designed the Nautilus and the Royal Oak?
Gérald Genta designed both. He sketched the Royal Oak in 1971 for Audemars Piguet, and the watch launched in 1972 as a luxury steel sports watch that cost more than many gold dress watches of its day. The Nautilus came four years later and borrowed the porthole idea, turning the whole case into a single rounded form. Because the same hand drew both, the family resemblance is real, and the differences come down to angles versus curves.
Which is more comfortable on the wrist?
It depends on your wrist and your taste, and both wear close to the skin for steel sports watches of this size. The Royal Oak 15500 has a 41 mm case and an angular profile that sits visibly on the wrist, with a bracelet that tapers. The Nautilus 5711 is 40 mm, but its case is wider across the ears than the number suggests, which gives it a rounder, more compact presence. Try both on before choosing if you can: bracelet taper, case height and lug-free shape feel different from the specifications.
How do the movements compare?
Both use in-house automatic movements, and the Royal Oak 15500 typically offers a longer power reserve than the Nautilus 5711. The 15500 runs the caliber 4302 with roughly 70 hours of reserve. The 5711 runs the caliber 324 S C (26-330 S C from 2019), with a shorter reserve of 35 to 45 hours. For most owners the difference shows up only when a watch sits unworn over a long weekend, so finishing and brand preference tend to matter more than the number.
Which is easier to buy?
The Royal Oak is generally the easier watch to track down. Audemars Piguet still produces steel Royal Oak references in the range, while the steel Nautilus 5711 was discontinued in 2021 and has not had a direct steel successor of the same type. That scarcity is why the steel Nautilus is the harder chase and why buyers often come to a sourcing desk for it. The Audemars Piguet Royal Oak collection and the Royal Oak 15500 references are good places to see which configurations we can source, and the Patek Philippe Nautilus collection does the same on the Patek side.
How do they behave on the resale market?
Both hold their value better than most luxury watches, but neither is a guaranteed investment. Discontinued steel Nautilus references have commanded a large premium over their original retail level, while Royal Oak premiums are generally smaller and vary more by reference and dial. Pricing moves with demand, so treat any figure you read as a dated observation, and avoid borrowing money on the assumption that a watch will appreciate. Condition, completeness of papers and originality all influence what a watch fetches later.
Is there a Nautilus complication to compare with the Royal Oak?
Yes: both houses build chronograph versions of these cases, and the Nautilus chronograph appears in the Patek Philippe 5980 references. Chronograph versions are larger, more complex and more expensive to service than the three-hand watches in the table above. If you want a chronograph, compare it against the Royal Oak chronograph range as a separate decision, since the choice between a simple and a complicated watch matters more than the brand.
Which one should you choose?
- Choose the Royal Oak if you want a bolder, more angular look, a longer power reserve and a watch that is easier to source.
- Choose the Nautilus if you prefer a softer, more discreet silhouette and accept a longer, more selective search.
- Consider the brand-level picture in our Audemars Piguet vs Patek Philippe comparison if the choice is really between the two houses rather than the two models.
Quick answers
Is the Nautilus better than the Royal Oak?
Neither is objectively better. The Royal Oak is bolder and easier to buy, while the Nautilus is quieter and harder to find in steel. Pick on the look you prefer on your own wrist.
Did the same person design the Nautilus and the Royal Oak?
Yes. Gérald Genta designed both, the Royal Oak first in the early 1970s and the Nautilus a few years later.
Which has the longer power reserve?
The Royal Oak 15500 does, at roughly 70 hours against around 45 hours for the Nautilus 5711. Confirm the figure for the specific reference you are considering.
Is the steel Nautilus still in production?
The classic steel Nautilus 5711 was discontinued in 2021. That is a major reason it is harder to find than a steel Royal Oak.
Does Bizak & Co. keep these watches in stock?
No. Bizak & Co. is a sourcing desk: we find a specific unit to order and confirm its details before you commit.
Related reading: Audemars Piguet vs Patek Philippe, Patek Philippe Nautilus vs Aquanaut and the Patek 5711 guide.
Get your Nautilus or 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.
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