Rolex · Sky-Dweller

Strap for Sky-Dweller White Gold / Ivory

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width21 mm
Case diameter42 mm
Reference326939-0001
FamilySky-Dweller
MovementRolex caliber 9001 hours, minutes, seconds, Additional 24 hours Hand (adjustable) | date, annual calendar, month | chronometer
Year2012/1 - 2018
CaseWhite Gold

Recommended spring bar

Spring bars Rolex Sky-Dweller 42 — 21mm × 1.5mm

Technical match for lug width and diameter · lug 21 mm · Ø 1.5 mm · closed lugs

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Straps for the Sky-Dweller 326939-0001

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Sky-Dweller 326939-0001, seen from the bench

The Sky-Dweller 326939-0001 is a Rolex complication featuring a 42 mm white gold case with annual calendar, GMT function, and Rolex's patented rapid adjustment system. Powered by the in-house caliber 9001 automatic movement, certified Chronometer and COSC-certified, it displays hours, minutes, seconds, independent GMT hand, numerical date window, and annual calendar with month indicator. The 21 mm lug width is critical for strap compatibility and must be measured precisely between the lateral attachment pins for proper fit with replacement leather or rubber straps.

Frequently asked questions

What is the lug width of the Rolex Sky-Dweller 326939-0001?

The Rolex Sky-Dweller 326939-0001 features a lug width of 21 millimetres. This measurement is critical for strap selection: any strap with a different lug width will fail to seat properly, either leaving gaps or binding uncomfortably. To verify correct measurement, use a digital calliper positioned between the spring bar attachment points, measuring the internal distance.

Which strap material is most appropriate for the 42mm Sky-Dweller in white gold?

For a 326939-0001 Sky-Dweller in white gold, the finest strap options are niloticus alligator (natural black or medium brown), vegetable-tanned calf, or premium vulcanised rubber. Black alligator represents the classical choice, providing visual contrast with the white gold case whilst enhancing the dark dial. Warm calf leather offers contemporary appeal and develops a personalised patina over time. Rubber is ideal for those utilising the watch in informal or humid environments.

How is the strap changed on a Rolex Sky-Dweller?

Changing a Rolex Sky-Dweller strap requires a spring bar tool—a specialised flathead or forked implement. Position the watch with the case facing upward, locate the lateral attachment pin and insert the tool gently into the groove beneath to compress the internal spring, allowing the pin to disengage. Repeat for both sides. Insert the new strap by aligning its holes with the case lugs and confirm the pin is secured with an audible click.

Is an aftermarket 21mm strap truly compatible with the 326939-0001?

Yes, any 21-millimetre lug width strap is dimensionally compatible. However, aesthetic compatibility depends upon build quality, proportions and finishing. A premium aftermarket strap in alligator or vegetable-tanned calf can equal—or exceed—original Rolex offerings, providing personalisation and added character. Avoid economical synthetic straps that would diminish the value of the white gold case and movement complication.

What is the expected lifespan of a leather strap on a daily-wear Sky-Dweller?

Strap longevity depends upon wear frequency, climate, maintenance and tanning quality. Premium niloticus alligator, worn daily, retains functionality and aesthetics for 3–5 years before visible wear becomes apparent (thinning around buckle attachment). Vegetable-tanned calf, being subject to tannic acid fragility, endures 2–4 years. Prolonged exposure to humidity, tropical climates or perspiration significantly shortens lifespan. With regular care—gentle cleaning, air-drying, temperate storage—longevity may extend by 12–18 months. A leather strap is not a consumable: it is an evolving aesthetic element, developing character and patina, eventually requiring replacement when the spring loses tension or leather becomes dangerously thin.

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