The Rolex Deepsea 126660 is a 44 mm Oystersteel dive watch rated to 3,900 m (12,800 ft). Rolex built it from 2018 to 2022 and replaced it with the 136660. Copies sold as first copy Deepseas match the dial print and the case outline in photos. They fail on five points you can check by hand: movement beat rate, bezel insert material, caseback metal, crystal engraving, and lume output.
Genuine 126660 specs, the baseline
- Case: 44 mm Oystersteel, about 18 mm thick.
- Water resistance: 3,900 m, Ringlock system, titanium caseback.
- Movement: calibre 3235, automatic, 28,800 vph, 70-hour power reserve.
- Bezel: black Cerachrom insert, numerals coated with platinum.
- Lume: Chromalight, blue emission.
- Bracelet: Oyster steel with Glidelock and Fliplock extension.
- Setting: hacking seconds, quick-set date.
Check the movement first
The 3235 beats 28,800 times per hour, so the seconds hand moves in 8 small steps per second. A copy with a 21,600 vph movement gives 6 steps and looks slower. A copy with a 28,800 vph clone can pass this test, so add the power reserve test: set the watch, leave it off the wrist for 48 hours, then check if it still runs and keeps time. A 40-hour movement stops. The genuine date snaps over at midnight. Many copies creep.
Bezel, dial, and crystal
The Cerachrom insert is black ceramic. Platinum sits in the engraved numerals, so they look matte and sit below the surface. Copies use aluminium or painted numerals. The paint looks glossy and rubs off at the edges. On the dial, the text DEEPSEA and 3900m=12800ft is crisp under a loupe. Copies show fuzzy edges and uneven spacing.
The sapphire crystal carries a laser-etched coronet at 6 o'clock, with 5 dots under it. It is visible under 10x magnification and not to the eye. Many copies skip it or cut it too large. The cyclops over the date has an anti-reflective coating on the underside. The date sits centered in the lens.
Caseback, crown, bracelet
The caseback is titanium. A copy often uses steel and feels different on the wrist. The Triplock crown has 3 dots under the coronet and a helium escape valve sits at 9 o'clock. The Glidelock clasp ratchets through about 18 mm of adjustment and closes with a firm click. Copies use stamped clasps, soft springs, and screws that strip.
Serial, card, and price
Rolex engraves the serial on the rehaut at 6 o'clock and between the lugs. The warranty card carries the same serial and the reference 126660. Cards get copied, so a card is not proof. Genuine 126660 examples trade in the five-figure USD range. A listing at $200 to $800 is a replica, not a discount. Rolex does not sell through dealers who discount.
What a visual check cannot prove
A replica with a cloned 3235 movement and a ceramic bezel can pass a photo check and a wrist check. Only a watchmaker with a caseback tool and a timing machine confirms the movement. Public data on how many 126660 replicas are in circulation does not exist.