Nautilus vs Aquanaut: Which Patek Philippe Sports Watch to Buy

Nautilus vs Aquanaut is the first decision most buyers face inside the Patek Philippe sports catalogue, and the short answer is that the Nautilus is the dressier, heavier, more expensive watch on an integrated bracelet, while the Aquanaut is the lighter, more casual watch on a composite strap that costs roughly half as much on the secondary market for the equivalent steel time-and-date reference. Both share Gerald Genta's porthole lineage, both are rated to 120 m, and both use the same family of self-winding calibres, so the choice comes down to how the watch wears, how formal it needs to be and how much of the budget goes to the bracelet. This guide sets out the specifications, the design and wearing differences, the current and recent references of each, dated dealer asks in 2026 and what to check before buying either. Bizak & Co. sources both lines to order; the Nautilus collection and the Aquanaut collection list the configurations we can seek.

Last reviewed on September 25, 2026 by Filip Biczak. Prices are dated observations, not quotes.

Nautilus vs Aquanaut at a glance

Sources: the Patek Philippe Nautilus collection page and the Patek Philippe Aquanaut collection page list every current reference with case size, calibre and water resistance.

How do the Nautilus and Aquanaut differ in design?

The Nautilus case is a two-part construction: a monobloc caseback and a bezel that screws down through the two "ears" on the flanks, a detail Genta borrowed from the hinged porthole of a transatlantic liner. The bezel is a rounded octagon with a polished chamfer, the dial carries horizontal embossed stripes, and the bracelet flows straight out of the case with no visible lugs. The Aquanaut keeps the rounded octagonal bezel but drops the ears, adds a conventional three-part case with a screw-down crown, and swaps the stripes for a chequered grid that repeats on the strap. Side by side, the Nautilus reads as a piece of jewellery that happens to be water resistant; the Aquanaut reads as a sports watch that happens to be Patek Philippe. That difference in intent is why the two lines rarely compete for the same buyer once both have been worn.

How do they wear on the wrist?

A steel Nautilus 5711/1A on its bracelet is one of the heaviest 40 mm watches in the category, and the weight is what people notice first. The case is about 8.3 mm thick and the integrated bracelet tapers sharply, so it sits flat and slides under a cuff, but the mass is always present. The Aquanaut 5167A is about the same diameter and thickness, yet on its composite strap it weighs a fraction of the Nautilus and disappears in wear. The strap is also the reason the Aquanaut suits warm climates and travel: it does not pinch hair, it rinses clean, and a replacement is a service item rather than a restoration. Wrists under about 16.5 cm (6.5 inches) tend to prefer the Aquanaut's lighter footprint; larger wrists carry either, and the 5811/1G's extra millimetre helps on the Nautilus side.

Which references are current in 2026?

• Nautilus 5811/1G-001. White gold, 41 mm, blue gradient dial, calibre 26-330 S C, introduced in 2022 as the successor to the discontinued steel 5711/1A. The only time-and-date Nautilus in the current catalogue at that size.
• Nautilus 5712/1A-001. Steel, 40 mm, moon phase, power reserve and pointer date on the calibre 240 PS IRM C LU; the steel Nautilus you can still order new.
• Nautilus 5990/1A-001. Steel, 40.5 mm, flyback chronograph with Travel Time; our 5990 guide covers it.
• Aquanaut 5167A-001 and 5167R-001. Steel or rose gold, 40 mm, black or brown embossed dial, composite strap; the core Aquanaut since 2007 and the subject of our 5167 guide.
• Aquanaut 5164A-001. Steel, 40.8 mm, Travel Time with two pushers and day-night indicators; the most practical Aquanaut for travellers.
• Aquanaut 5968A-001 and 5968G. 42.2 mm flyback chronograph in steel with orange accents or in white gold with blue or green dials.

The steel Nautilus 5711/1A-010 was discontinued in 2021 after a green-dial 5711/1A-014 farewell, which is why the steel Nautilus now trades only on the secondary market and carries the largest premium in the Patek catalogue.

How much is a Nautilus vs an Aquanaut? Dealer asks in 2026

Retail is a different story. Patek Philippe's list price for the steel 5167A has sat in the low-to-mid US$20,000s in recent years and the 5811/1G in the high US$60,000s to low US$70,000s, so both lines trade at multiples of retail on the open market, with the steel Nautilus carrying the widest gap. Those figures describe what we saw and will move. Ask for a dated quote for the exact reference, dial and set; our Patek Philippe price guide explains how to compare quotes.

Which holds value better, Nautilus or Aquanaut?

Historically the Nautilus has appreciated more in absolute terms and the Aquanaut more in percentage terms from a lower base, and both fell from their 2022 peaks before stabilising through 2024 and 2025. The steel 5711 is a fixed supply now that production has ended, which supports its price; the 5167A is still made, so its premium depends on Patek keeping allocations tight. Neither is a watch to buy above market and flip. Buy the one you will wear; if resale matters, ask for a written cash-buy assessment before you commit and keep the full set together, because a Nautilus or Aquanaut without its certificate of origin sells at a meaningful discount.

Nautilus or Aquanaut: which should you buy?

• Choose the Nautilus if the integrated bracelet is the point, if the watch will be worn with tailoring as often as with a T-shirt, and if the budget stretches to a steel 5711 or a gold 5811.
• Choose the Aquanaut if you want the same case language at roughly half the outlay, if you travel or live somewhere warm, or if a strap watch suits the rest of your collection better than another bracelet.
• Choose the 5164A if you want a genuinely useful complication; the Travel Time is the most practical movement in either line.
• Choose a gold Aquanaut or a steel 5712 if you want something less obvious than the steel Nautilus at a similar price.

Buying a used Nautilus or Aquanaut: what to check

• Certificate of origin. The certificate names the reference, movement and case numbers and the retailer; it must match the watch. Patek Philippe does not reissue certificates, and its Extract from the Archives is a separate document.
• Case and bracelet edges. The Nautilus bezel chamfer and bracelet link edges should be crisp; a soft, rounded bezel means polishing, which is expensive to correct on this case shape.
• Bracelet stretch and clasp. Hold a Nautilus by the clasp and check the links hang straight; the fold-over clasp should close with a clean click and the safety catch should hold.
• Strap condition. An Aquanaut strap with cracking at the clasp end is due for replacement; that is normal wear, but price it in and confirm the clasp is the correct Patek Philippe part.
• Dial and hands. Embossing should be sharp under a loupe and the lume plots even; replaced dials are rare but service-replaced hands are not.
• Movement. A 324 S C or 26-330 S C should run within a few seconds a day; ask for the last service date and a pressure test before swimming in either watch.
• Price against the band. A full-set steel Nautilus offered well under the market is the single most reliable warning sign.

Our authentication process describes what we inspect before dispatch, and our Patek Philippe authentication guide goes deeper on documents and extracts.

Quick answers

Is the Aquanaut cheaper than the Nautilus?

Yes, at retail and on the secondary market. On 25 September 2026 Bizak's sourced catalogue listed a steel Aquanaut 5167A-001 at US$77,620 and a steel Nautilus 5711/1A-010 at US$152,440, both sourced to order.

Is the Nautilus discontinued?

The steel time-and-date 5711/1A was discontinued in 2021. The Nautilus line continues with the white gold 5811/1G, the steel 5712/1A moon phase, the 5990/1A chronograph and precious-metal references.

Are the Nautilus and Aquanaut the same size?

Close. The Nautilus 5711 is 40 mm and the 5811 is 41 mm; the Aquanaut 5167 is 40 mm and the 5164 Travel Time is 40.8 mm. The Aquanaut wears lighter because of its composite strap.

Can you swim with a Nautilus or Aquanaut?

Both are rated to 120 m and have screw-down crowns, so swimming is within their design. Have the seals pressure-tested if the watch has not been serviced recently.

Do the Nautilus and Aquanaut use the same movement?

The time-and-date versions do: calibre 324 S C on earlier examples and calibre 26-330 S C with stop-seconds on current ones. Complicated references use different calibres.

Request a Nautilus or Aquanaut sourcing quote

Tell us the reference, dial colour, condition and whether the certificate of origin 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: Nautilus 5711/1A-010, Nautilus 5811/1G-001, Aquanaut 5167A-001, Aquanaut 5164A-001; browse the Nautilus collection, the Aquanaut collection, or sell or trade your Patek Philippe.

Related reading: Aquanaut 5167 guide · Nautilus 5990 guide · Nautilus 5726 guide · Patek Philippe price guide.