Short answer
"Deepsea 4000" is buyer shorthand, not a Rolex model name. It blends two figures: the Sea-Dweller 4000 rating of 4,000 ft (1,220 m) and the Deepsea case rated to 12,800 ft (3,900 m). A listing with that phrase points to a replica of the 44 mm Deepsea ref. 116660, often in the D-Blue dial. Judge the watch on case shape, crystal dome, bezel action, helium valve, bracelet, and movement. The label in the listing tells you little.
What the numbers describe
The Sea-Dweller 4000 (ref. 116600) is a 40 mm watch rated to 1,220 m with a helium escape valve at 9 o'clock. The Deepsea (ref. 116660) is a 44 mm watch with a thicker case, a 5.5 mm sapphire crystal, a Ringlock inner ring, and a titanium caseback. Both use a ceramic bezel with a 60 minute scale and a Chromalight display. Replicas often merge the two references, so check the case diameter before you buy.
Parts that decide quality
Case and crystal
- Case sides should be brushed, with polished chamfers on the lugs.
- The crystal dome should sit above the bezel by roughly 1 mm on the Deepsea.
- Crown guards must be thick and flat, not rounded blobs.
Bezel and lume
- A ceramic insert should have a deep, even fill in the numerals.
- The bezel click must be firm, with 120 positions and no back play.
- Lume should glow blue and fade over hours, not seconds.
Bracelet and clasp
- The Oyster bracelet needs solid center links and no rattle.
- The Glidelock clasp should slide and lock without tools.
- End links must sit flush against the lugs.
Inspection steps
- Measure the case across the bezel with calipers and confirm 44 mm.
- Weigh the head on a scale and compare it to the 200 g range of the original.
- Turn the bezel through a full rotation and listen for even clicks.
- Press the helium valve and check that it moves and seals.
- Wind the crown 30 turns and note the resistance and crown thread feel.
- Set the watch dial up and check the rate over 24 hours.
- Inspect the date window under a loupe for a centered, sharp print.
- Submerge the watch in a pressure tester only if the seller allows it.
Movement choices
Most replicas run an ETA 2824 clone, a Sellita SW200 clone, or an Asian 2836. A 2824 base gives a smooth sweep and easy parts access. A 3135 clone adds a correct crown position and date change direction. Ask which movement is inside and whether the rotor is decorated. A noisy rotor and a gritty hand wind are signs of a low grade build.
Water resistance reality
No replica is tested to 3,900 m or 1,220 m. Gaskets on a replica case may hold for swimming, but a dive watch standard such as ISO 6425 covers pressure testing, legibility, and bezel security that a replica does not meet. Treat a replica as splash resistant at best unless a shop pressure tests it and states the result.
Red flags in listings
- Photos of a genuine watch used as stock images.
- Claims of 1:1 without a movement name.
- No caseback photo, so you cannot see the engraving or the gasket.
- Sellers who call the watch a Rolex instead of a replica.
Practical note
A replica is not a Rolex and cannot be sold or represented as one. The Swiss Made label is a protected designation with legal criteria, so a replica that carries it is making a false claim. Buy for the look and the build, keep your receipt, and never pass the watch off as an original.