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Rolex · Sea-Dweller

Strap for Sea-Dweller 16660 Matte Mark 1

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

Lug width

20mm
20 mm strapsAll Rolex
Lug width20 mm
Case diameter40 mm
Reference16660 Matte MK1
FamilySea-Dweller
MovementRolex caliber 3035 Hours, Minutes, Seconds | Date | Chronometer
CaseStainless Steel

Recommended spring bar

Spring bars Rolex Sea-Dweller 16600 — 20mm blind lugs

Technical match for lug width and diameter · lug 20 mm · Ø 1.5 mm · closed lugs

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Straps for the Sea-Dweller 16660 Matte MK1

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Sea-Dweller 16660 Matte MK1, seen from the bench

The Rolex Sea-Dweller 16660 Matte MK1 represents the pinnacle of Rolex's diving watches from the 1980s, featuring the Caliber 3035 movement paired with a unidirectional rotating bezel. The 40mm stainless steel matte case with 20mm lugs embodies the technical specifications for professional deep diving up to 4000 feet, equipped with a scratch-resistant sapphire crystal, ceramic unidirectional bezel, and a fixed caseback. The white or black dial maintains legibility in low-light conditions, while the 20mm lug width is the standard for Rolex sport watches of this generation.

Frequently asked questions

What is the lug width of the Rolex Sea-Dweller 16660 Matte MK1?

The lug width (end link width) of the Sea-Dweller 16660 Matte MK1 is 20mm. This is the standard measurement for Rolex Sports Watches of this generation and is essential for proper fit without tension on the lugs.

Which strap material is most suitable for the Sea-Dweller 16660 Matte MK1?

Alligator leather with vegetable tanning offers the most refined aesthetic with natural patina development. Shell cordovan provides superior durability and a distinctive grain. Italian calf represents the balance between suppleness and longevity. For intensive water use, FKM rubber or Cordura NATO straps offer practicality and moisture resistance.

How do you correctly change the strap on this model?

The Sea-Dweller 16660 requires a spring bar tool to remove the lug pins. Position the watch carefully, gently depress the spring bar with the tool to release the old strap, then insert the new strap ensuring the pin is fully seated. A specialist atelier ensures precision and security.

Is an aftermarket strap compatible with the Sea-Dweller 16660?

Yes, any 20mm strap is compatible with the Sea-Dweller 16660 Matte MK1. The standardised lug width allows the use of leather, rubber, NATO, or steel straps. Choosing superior materials honours the quality of the timepiece.

How long does a quality leather strap last on a watch like the 16660?

A superior quality leather strap (alligator with vegetable tanning or shell cordovan) lasts approximately 5-8 years with daily wear, developing a noble patina. Lifespan depends on exposure to moisture and perspiration. A specialist atelier can perform maintenance and surface renewal to extend the strap's life.

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