What is the Rolex 16660?
The Rolex 16660 is the Sea-Dweller that collectors call the "Triple Six." Rolex built it from 1978 to roughly 1988, and it was the first Sea-Dweller to switch from plexiglass to a sapphire crystal.
It also pushed the depth rating to 1,220 meters (4,000 feet) and introduced the caliber 3035 with a quickset date. A replica Rolex 16660 is popular because that matte dial, thick case, and helium escape valve are simpler to reproduce well than the finishing on modern references.
Rolex 16660 vs. Rolex Datejust: A Comprehensive Guide
Rolex 16660 specs at a glance
- Case size: 40 mm, roughly 15 mm thick, stainless steel
- Crystal: flat sapphire with no cyclops magnifier
- Bezel: unidirectional, 60 minute graduations
- Depth rating: 1,220 m / 4,000 ft with helium escape valve at 9 o'clock
- Movement: Rolex caliber 3035, 28,800 vph, quickset date
- Dial: matte black with tritium lume plots and white gold surrounds on later examples
Why the 16660 is a favorite in the replica market
The Triple Six sits in a sweet spot: vintage looks without the fragility of a plexiglass crystal.
How Much Is a Rolex 16660 Replica? Price Guide
Its dial layout is clean and symmetrical, so a well made replica reads correctly at arm's length. The case shape is also forgiving, and a slightly soft lug profile bothers buyers far less here than on a modern Submariner.
Rolex 16660 vs. Authentic: What Actually Gives a Replica Away
Supply of good genuine examples keeps shrinking, which is exactly why the replica version stays in demand.
What should you check on a replica 16660?
Case and dimensions
Look for a 40 mm case with thick, straight lugs and a crown guard that does not look pinched. The mid case should feel substantial, not hollow or rattly when tapped.
Crystal, bezel and insert
The crystal must be flat sapphire with no magnifier over the date. The bezel should turn with firm, even clicks, and the insert should use a matte black finish with clean, non blurry numerals.
Dial, lume and hands
Ask for close up photos of the dial printing and the lume plots. Even, cream toned lume and sharp text separate a good replica from a cheap one.
Movement
Most replicas run an Asian 2824 or 2836 clone, and some use a 3135 style movement. A 2836 gives you a smooth sweep and a working quickset date.
Bracelet and clasp
Check for a solid link Oyster style bracelet, a correctly stamped clasp, and end links that sit flush against the case with no gaps.
Is a replica 16660 a good daily wearer?
Yes, if the watch is properly sealed and the movement is serviced. The sapphire crystal resists scratches, the case handles water exposure in normal use, and the vintage proportions fit most wrists.
Keep in mind that a replica is a tribute piece, not an investment, and it should never be sold or represented as a genuine Rolex.
FAQ
How do I spot a low quality replica 16660?
Blurry dial text, a domed crystal, a bezel insert with glossy paint, and lume that glows bright green are the usual giveaways.
What size wrist suits the 16660?
The 40 mm case and 20 mm lugs work on wrists from about 6 to 8 inches, similar to a Submariner.