Short answer

The Rolex Deepsea 126660 is a 44 mm dive watch rated to 3,900 m (12,800 ft). Rolex sold the reference from 2018 to 2022. It uses an Oystersteel case, a cal. 3235 movement, and a 70-hour power reserve. US retail started at $12,950 in 2018. Rolex replaced the 126660 with the 136660 in 2022. A replica is a copy of this watch. No replica matches the caseback, the movement, or the depth rating.

Specs to compare against

  • Reference: 126660. Production: 2018 to 2022.
  • Case: Oystersteel, 44 mm wide, 17.7 mm thick.
  • Water resistance: 3,900 m. Ringlock system holds a nitrogen-alloyed steel ring, a 5.5 mm domed sapphire crystal, and a titanium caseback.
  • Helium escape valve at 9 o'clock.
  • Bezel: black Cerachrom ceramic insert, 60-minute scale, platinum-coated numerals, 120 clicks.
  • Dial: black or D-blue gradient. Chromalight markers. Date at 3 o'clock with 2.5x cyclops.
  • Movement: cal. 3235, automatic, 28,800 vph, 31 jewels, 70-hour power reserve, Chronergy escapement.
  • Bracelet: Oyster, Glidelock clasp with 20 mm of adjustment in 2 mm steps, plus a Fliplock extension for dive suits.

What replicas get wrong

Most copies of the 126660 fail on a small set of points. Check these before paying:

  • Caseback: the real watch uses titanium with deep Ringlock engraving. Many replicas use steel and shallow stamps.
  • Case height: replicas often measure 18.5 mm to 19 mm. The movement and caseback add height.
  • Crystal: the genuine sapphire is 5.5 mm thick with a domed profile. Replicas use thinner sapphire and a flatter curve.
  • Bezel action: 120 clicks, firm, no back play. Replicas use a wire spring and feel loose.
  • Movement: replica plates stamped 3235 sit on 2836 or 3135 clones. Power reserve drops to about 40 hours or less.
  • Dial text: spacing of DEEPSEA and RING LOCK SYSTEM. Edges blur under a loupe.
  • Cyclops: magnification is 2.5x on the real watch. Replicas ship 2x or less.
  • Steel: 316L is common in replicas. Rolex uses 904L. Hardness and polish differ.

Depth ratings

Rolex pressure-tests each Deepsea to 3,900 m. A replica case is not tested. Gaskets, crown threads, and caseback threads decide real water resistance. Many replicas leak at 30 m to 50 m. Do not dive with one. If a seller claims 3,900 m, ask for a pressure test report. ISO 6425 sets the standard for dive watches.

Checks in hand

  1. Weigh the watch. The genuine head and bracelet sit near 210 g. Many replicas run 15 g to 30 g lighter.
  2. Measure case thickness with calipers.
  3. Find the laser-etched coronet at 6 o'clock on the crystal.
  4. Look at the rehaut engraving. Letters align with the minute track on the real watch.
  5. Turn the bezel and count 120 clicks.
  6. Watch the date change. The cal. 3235 flips it in a few minutes.
  7. Open the caseback if you accept the risk of a gasket reseat.

Market notes

Replicas of the 126660 sell for $300 to $600 in most cases. Higher prices come from 904L cases, clone 3235 movements, and better finishing. No replica uses a genuine Rolex movement. Treat SWISS MADE dial text as a print detail, not a parts claim. Most replica movements come from China.