The replica Rolex 16660 — the Sea-Dweller collectors nicknamed the "Triple Six" — brings one of the most important moments in dive-watch history within reach. This is the reference that moved the Sea-Dweller to a sapphire crystal and a 1,220-meter depth rating, and a well-made replica captures that late-1970s transition look in convincing detail. If you want the slab-sided heft and matte dive-tool character of the original without chasing one at auction, this is the version to shortlist.
Key Features
- Approximately 40 mm stainless steel case with the thick, flat-sided Sea-Dweller profile
- Helium escape valve on the left case flank, positioned and finished to match the reference
- Black rotating bezel with crisp dive graduations and a firm, clicky action
- Domed sapphire crystal over a matte black dial with luminous hour plots
- Date window at 3 o'clock with a cyclops magnifier
- Signed screw-down case back with the correct engraved marking style
- Oyster-style bracelet with a flip-lock clasp and removable links
Materials and Specifications
The case and bracelet are cut from 316L stainless steel with a brushed finish that reads correctly in daylight — satin on the lugs and bracelet, polished only where the original was polished. The bezel insert is a printed aluminum-style disc under a domed sapphire crystal, which is the detail that separates a serious 16660 build from a generic dive watch. Inside, an automatic movement drives hours, minutes, seconds and a quickset date, and the screw-down crown and case back are gasketed so the watch stands up to swimming and shower wear. Case thickness is intentionally substantial, matching the reference's deep-dive proportions rather than slimming it into a dress watch.
Rolex 16660 Replica Guide: Spotting Quality on the 'Triple Six'
Shipping and Returns
Orders are packed in a protective travel pouch with the bracelet protected and ship within a short handling window, with tracking provided on every parcel. If the fit or finish is not what you expected, returns are accepted within the stated window as long as the watch comes back unworn apart from fitting, with its protective stickers and packaging intact.
How does the 16660 differ from other Sea-Dweller replicas?
It is the transitional reference: sapphire crystal and the higher depth rating, but still the older case architecture and dial layout. That combination is why collectors call it the Triple Six.
Does the helium escape valve actually work?
On a properly built replica the valve is functional and unscrews, though in everyday wear it is decorative — it matters for authenticity and for matching the original's silhouette.
Will the bracelet fit larger wrists?
Yes. The Oyster-style bracelet ships with removable links and a flip-lock clasp, so most buyers can size it at home with a small screwdriver or have a jeweler do it in minutes.