The Patek Philippe Nautilus 6790 is not a reference number in Patek Philippe's official catalog. Nautilus references follow the 3700, 5711, 5712, 5726, 5980 and 5990 families, so a watch sold as "Nautilus 6790" is a mislabeled model, a listing typo, or a replica. Start any inspection by matching the reference engraved on the caseback against Patek's published records.
Is the Patek Philippe Nautilus 6790 a real reference?
No. Patek Philippe has never listed a Nautilus 6790 in its catalog or in factory service documentation, and the number does not appear in the brand's current collection. Watches advertised under that number are usually replicas or frankens built on a 5711-style case with swapped parts. Because the reference itself is wrong, every other detail becomes a red flag until it checks out.
What gives away most fake Nautilus watches?
Genuine Nautilus cases are finished to a standard replicas rarely reach, and the giveaway details repeat across references.
- Case profile: the 5711 case measures roughly 8.3 mm thick and tapers into a slim, angled bezel. Replicas run thick, with soft bezel edges and a domed caseback.
- Bracelet: links are brushed on top and polished on the sides with tight tolerances. Fake bracelets rattle, show gaps at the lugs, and lose their satin grain within months.
- Bezel bevel: the angled bevel should be mirror polished and wide enough to catch light in one clean line.
- Caseback engraving: reference numbers and hallmarks are laser crisp. Replicas show shallow, uneven, or doubled characters.
How do you check the dial and date window?
The dial is where most fakes fall apart under a loupe. Genuine Nautilus dials have horizontally embossed grooves with even depth and a clean transition into the minute track. Replica dials show shallow grooves, smeared printing, and a date window that sits off center with a font that is too wide or too thin.
On authentic watches, the date disc sits flush and the aperture edges are cut square rather than rounded. Lume plots, hands, and the "Patek Philippe" signature should all align to the second hand pinion. Any tilt means the dial was reprinted or the movement was rebuilt.
What movement should be inside?
A genuine Nautilus runs an in-house caliber finished with Geneva stripes, polished bevels, and a signed rotor. A 5711 uses the 26-330 S C or the older 324 S C. Replica movements are commonly decorated Miyota 9015, Seiko NH35, or Chinese clones that copy the finish but not the architecture. Check the balance wheel position, the bridge shape, and whether the rotor engraving is stamped or engraved.
Which references should you compare against?
- 5711/1A: time and date, the closest match for most "6790" listings.
- 5712/1A: moonphase and power reserve subdial.
- 5726/1A: annual calendar with three apertures.
- 5980 and 5990: chronograph layouts.
Asking the seller to confirm the caseback reference before money changes hands clears up most of the confusion caused by a bogus 6790 number.