Rolex · Day-Date II

Strap for Day-Date II Everose Black Roman

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
Reference218235-0034
FamilyDay-Date II
MovementRolex caliber 3156 Hours, Minutes, Seconds | Date, Day | Chronometer
CaseRose Gold

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

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Straps for the Day-Date II 218235-0034

Selected for the 21 mm lug width · workshop selection

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The Day-Date II 218235-0034, seen from the bench

The Day-Date II represents the evolution of the classic Day-Date with an enlarged case compared to the original model. It is equipped with the automatic Caliber 3156 certified as a chronometer, with indication of hours, minutes, seconds, date and day of the week. The lugs measure 21mm in width.

Frequently asked questions

What is the lug width of the Rolex Day-Date II 218235-0034?

The Rolex Day-Date II 218235-0034 features a 21 mm lug width. This measurement corresponds to the distance between the metal lugs (spring bar attachment points) and determines compatibility with aftermarket straps. Any strap with a 21 mm lug width will fit this model perfectly.

What is the best strap for the Rolex Day-Date II 218235-0034?

For this rose gold model, we recommend alligator leather with vegetable tanning in dark brown or black—the chromatic contrast enhances the elegance of the case. Alligator develops a natural patina over time that complements the aging of rose gold. Shell cordovan is an excellent alternative for those seeking superior resistance to daily wear.

How do I change the strap on the Rolex Day-Date II 218235-0034?

Strap replacement requires a spring bar tool (small metal lever) and a soft surface to avoid scratching the case. Release the small internal button of the spring bar on each lug, remove the previous strap, and insert the new one, ensuring the spring bar clicks fully into position. If uncertain, consult a professional watchmaker.

Is an aftermarket 21mm strap compatible with the Rolex Day-Date II 218235-0034?

Any strap with a 21 mm lug width is compatible with the 218235-0034. The lug width determines the physical attachment to the watch. We recommend artisanal straps that respect the proportions of the case (41 mm), with a width at the wrist of approximately 18-19 mm for optimal aesthetic balance.

How long does a leather strap last on the Rolex Day-Date II 218235-0034?

A high-quality leather strap (alligator, cordovan, calf) typically lasts 3–5 years with daily use, provided it receives regular maintenance—gentle cleaning with a damp cloth, complete drying, and protection from direct heat sources. Vegetable-tanned leather ages well: cordovan can reach 7–10 years of use with proper care.

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