Rolex · Day-Date II

Strap for Day-Date II Platinum Black Arabic

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

Lug width21 mm
Case diameter41 mm
Reference218206-0003
FamilyDay-Date II
MovementRolex caliber 3156 Hours, Minutes, Seconds | Date, Day | Chronometer
CasePlatinum

Recommended spring bar

Spring bars Rolex Day-Date 40 — 21mm × 1.5mm

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

All Rolex spring barsOpen →

Straps for the Day-Date II 218206-0003

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Day-Date II 218206-0003, seen from the bench

The Day-Date II represents the evolution of the classic Day-Date with a larger case compared to the original model. It features the automatic 3156 caliber certified as a chronometer, with indications of hours, minutes, seconds, date, and day of the week. The lugs measure 21mm in width for the strap.

Frequently asked questions

What is the lug width of the Rolex Day-Date II 218206-0003?

The Rolex Day-Date II reference 218206-0003 features a lug width of 21.00mm. This measurement is specific to the 41mm case and represents the Rolex construction standard for this generation. Any compatible strap must be crafted with 21mm lugs mounted in perfect fit, with no lateral play.

What is the best strap for the Day-Date II 218206-0003?

For the Day-Date II 218206-0003 in platinum, we recommend Nile or Mississippi alligator with extended tanning (where grain remains stable), or shell cordovan which develops exceptional patina over time. Vegetable-tanned calf represents a robust choice for formal environments. Avoid coloured or plastified-texture straps: platinum demands absolute textile nobility.

How do I change the strap on my Day-Date II 218206-0003?

Rolex provides a specialised spring bar tool with your watch. Position the timepiece face-down, insert the tool into the small lateral notch on the lug and gently press downward to release the pins. Remove the old strap, align the new one with the lugs and snap the pins home until you hear the characteristic 'click'. Verify that the strap adheres to the lug face with no gaps.

Are there compatible aftermarket straps for the 218206-0003?

Yes, but with discernment. The aftermarket strap must feature lugs mounted at precisely 21mm width and thickness consistent with Rolex engineering standards. Ateliers such as Casati Milano produce bespoke 21mm straps to order, with leather choice, colour and buckle options (including platinum deployante). Online retailers offer prefabricated 21mm straps; always verify lug assembly quality.

How long does a leather strap last on a Rolex Day-Date II?

A fine leather strap (alligator, shell cordovan, calf) on a daily-worn watch lasts 3–5 years before maintenance or replacement becomes necessary. Longevity depends on tanning quality, wear frequency and ambient humidity. Premium leathers such as vegetable-tanned shell cordovan develop patina and remain intact for up to 7 years. FKM rubber straps maintain elasticity for 4–6 years.

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.

Request an appointment →

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