Rolex Sea-Dweller ’Triple Six Transitional’ – Reference 16660 (1984) RE

Heritage Narrative

Introduced in the early 1980s, the Rolex Sea-Dweller 16660 — known among collectors as the Triple Six — marked one of the biggest evolutionary leaps in the history of Rolex saturation-diving watches. Positioned between the vintage 1665 and the later 16600, this transitional reference introduced modern performance while preserving the tool-watch DNA that made the Sea-Dweller a legend.

This 1984 example features the upgraded sapphire crystal, dramatically increased depth rating, and the improved calibre 3035 with quickset date. It was also the first Sea-Dweller to adopt a thicker case and a helium escape valve engineered to withstand the extreme conditions of commercial saturation diving. At the same time, the matte black dial and tritium lume maintain the unmistakable vintage character of early Sea-Dwellers.

Full-set examples from this era have become increasingly difficult to find. With both original box and papers, this piece sits firmly in collector-grade territory, representing one of the most important transitional Sea-Dweller references ever produced.

Technical Specifications

Reference:
16660

Year:
1984

Movement:
Rolex automatic calibre 3035, quickset date, 28,800 vph, hacking seconds, COSC-certified

Case:
40 mm stainless-steel Sea-Dweller case, reinforced construction, helium escape valve

Bezel:
Unidirectional rotating bezel with black 60-minute insert (diving specification)

Crystal:
Sapphire crystal (first-generation Sea-Dweller sapphire)

Dial / Hands:
Black matte dial with tritium luminous hour markers, Mercedes hands with tritium lume

Bracelet / Clasp:
Stainless-steel bracelet with folding clasp and diver’s extension

Water resistance:
122 ATM (1220 m / 4000 ft) factory rating

Condition & Inclusions

Overall grade:
Vintage, well-preserved with honest wear consistent with an early sapphire-era Sea-Dweller

Service status:
Running and tested; service history not documented

Set:
Full set — original Rolex box and papers included

Shipping & Logistics

Shipped fully insured within 1–3 business days. Worldwide shipping available; buyer is responsible for any import duties or taxes.

Shipping & Returns

Complimentary insured worldwide shipping and a 14-day return window (watch must be returned in the same condition supplied). All watches undergo authentication, timing tests, inspection, and professional packing before dispatch. Returns are verified on arrival before refund or store credit is issued.