Rolex · Sea-Dweller

Strap for Sea-Dweller 16660 Comex Matte

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference16660 Comex Matte (aka: Seadweller)
FamilySea-Dweller
MovementRolex caliber 3035 Hours, Minutes, Seconds | Date | Chronometer
CaseStainless Steel

Recommended spring bar

Spring bars Rolex Sea-Dweller 1665 — 20mm Double Red

Technical match for lug width and diameter · lug 20 mm · Ø 2 mm · drilled lugs

All Rolex spring barsOpen →

Straps for the Sea-Dweller 16660 Comex Matte (aka: Seadweller)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Sea-Dweller 16660 Comex Matte (aka: Seadweller), seen from the bench

The Sea-Dweller ref. 16660 was introduced in 1978 as an evolution of Rolex's professional dive watch models. It features the automatic caliber 3035 with chronometer certification and functions of hours, minutes, seconds and date. The Comex version has a matte dial and 20mm lugs, developed for the commercial diving of the French company.

Frequently asked questions

What is the lug width of the Rolex Sea-Dweller 16660 Comex Matte?

The Rolex Sea-Dweller 16660 Comex Matte features a lug width of 20mm. This measurement is critical for identifying compatible straps and ensuring precise fitment between the case and strap, without play or excessive tension.

Which strap do you recommend for the Sea-Dweller 16660 Comex Matte?

For the Sea-Dweller 16660 Comex Matte, we recommend straps in alligator or vegetable-tanned calf leather, which enhance the sport-elegant character of the brushed case. Alternatively, a technical rubber strap offers practicality and protection in marine environments. Your choice depends on intended use: formal elegance, vintage aesthetics, or underwater functionality.

How do you change the strap on a Sea-Dweller 16660?

Strap replacement is performed by extracting the spring bars that connect the case to the lugs. Use a spring bar tool to gently lift the pin, remove the worn strap, and insert the new one, ensuring proper locking. For valuable timepieces, we recommend consulting a specialised workshop or Casati Milano atelier.

Which aftermarket straps are compatible with the 16660 Comex Matte?

All straps with a 20mm lug width are compatible with the Sea-Dweller 16660 Comex Matte. Compatibility is guaranteed by the standard width; however, to maximise the brushed case design, we recommend artisanal leather production in fine hides, alligator, shell cordovan, or quality rubber, avoiding overly rigid or poor-finish straps.

How long does a leather strap last on a Sea-Dweller?

A high-quality leather strap with vegetable tanning and artisanal finishing lasts an average of 3–5 years with moderate use. On a Sea-Dweller, subject to humidity fluctuations and marine environments, durability reduces to 2–3 years if frequently exposed to chlorine, salt, and UV. Casati Milano's warranty covers 18 months against manufacturing defects; periodic replacement remains advisable to maintain impeccable aesthetics.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only