There is no Rolex reference 16666. The number that appears in replica listings almost always points to the Sea-Dweller 16660, the 1978 to 1989 deep-diving model known as the Triple Six, or to the closely related 16600 built from 1989 to 2008. If you see 16666 in a product title, treat it as a search term rather than a real model number, and compare the watch you are offered against actual 16660 or 16600 specifications.
Is 16666 a real Rolex reference number?
No. Rolex reference numbers in the Sea-Dweller line run 1665, 16660, 16600, 116600, 126600 and 136660. The extra digit in 16666 comes from a typo, a padded listing keyword, or a repeated key press. A seller who cannot name the reference correctly rarely knows the case details either.
What is the Rolex Sea-Dweller 16660?
The 16660 replaced the 1665 and stayed in production from 1978 to 1989. It uses a 40 mm steel Oyster case, a helium escape valve at 9 o'clock, a sapphire crystal, and a depth rating of 1,220 meters or 4,000 feet.
Its dial is matte black with a date window and no cyclops magnifier, a detail that separates the Sea-Dweller from the Submariner Date. Early examples carry four lines of text, later ones five, and tritium markers on vintage pieces age to a warm patina.
What does first copy mean in the replica market?
- Labels such as first copy, 1:1, and super clone are marketing terms, not an official grading system.
- Quality depends on the factory, the batch, and the movement inside, not on the wording of the listing.
- Two watches sold under the same term can differ in case thickness, bezel action, and dial printing.
What should a buyer check on a replica Sea-Dweller?
Case diameter should sit near 40 mm with thickness around 15 mm, and lug width should measure 20 mm. The bezel should rotate one way with 60 crisp clicks, and the helium escape valve should sit flush on the left case flank.
The crystal must be flat with no magnifier over the date. Any cyclops on a Sea-Dweller copy is a sign that the case is built on a Submariner base.
Movement matters most. Genuine 16660 and 16600 watches use the Rolex 3035 or 3135, while replicas usually run a Chinese or Swiss clone such as an A2824 or a decorated 3135 copy. That choice drives hand sweep, date change behavior, and service life.
What are the cost and legal realities?
Replica Sea-Dwellers typically sell from about 80 to 600 US dollars depending on movement and finish, compared with 8,000 to 20,000 dollars or more for a genuine 16660 on the vintage market. No replica carries a Rolex warranty, factory service support, or resale value.
In the United States, trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320, and U.S. Customs and Border Protection can seize counterfeit watches at import. A replica cannot be legally advertised as genuine, and it should never be resold as an authentic Rolex.
How do you confirm a genuine reference number?
Check the engraving between the lugs at 12 o'clock and the reference stamped on the caseback or original papers. A Rolex Service Center can verify the reference and movement during a service estimate.