Rolex · Day-Date 36

Strap for Day-Date 36 White Gold - Diamond / Bright Blue - Baguette / President

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

Lug width20 mm
Case diameter36 mm
Reference128349RBR-0051 (aka: M128349rbr-0051)
FamilyDay-Date 36
MovementRolex caliber 3255 Hours, Minutes, Seconds | Date, Day | Chronometer
CaseWhite Gold

Recommended spring bar

Spring bars Rolex Daytona 116520 — 20mm steel

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

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Straps for the Day-Date 36 128349RBR-0051 (aka: M128349rbr-0051)

Selected for the 20 mm lug width · workshop selection

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The Day-Date 36 128349RBR-0051 (aka: M128349rbr-0051), seen from the bench

The Day-Date 36 represents the contemporary version of the classic Rolex watch with day and date indication. It is equipped with the automatic caliber 3255 certified as a chronometer, with hour, minute, second, date and day of the week functions. The 36mm case features 20mm lugs for the strap.

Frequently asked questions

What is the lug width of the Rolex Day-Date 36 128349RBR-0051?

The Rolex Day-Date 36 128349RBR-0051 features a lug width (ansa measurement) of precisely 20 millimetres. This dimension is standard for the model and requires straps constructed to this exact tolerance to ensure correct positioning on the case and maintain the elegant proportions of the presidential design.

What is the best strap for the Rolex Day-Date 36 128349RBR-0051 in white gold?

For the Day-Date 36 in white gold with champagne dial, alligator remains the natural choice: the fine texture of the reptile skin dialogues perfectly with the refined geometry of the case. Black alligator creates the most formal and timeless combination, whilst brown or cognac alligator introduces warmth whilst maintaining authority. Fine-grained calf leather in natural hide tone offers a versatile alternative with texture that adds three-dimensionality to the wrist.

How do you change the strap on a Rolex Day-Date 36?

Strap replacement requires the use of a spring bar tool and care. Position the watch with the caseback facing upward, insert the tool flat under the spring bar terminal from the inner side of the case, apply gentle downward pressure until the spring is released, then remove the old strap. Position the new strap and reinsert the spring bar. We recommend having this operation performed by a certified Rolex watchmaker to avoid damage to the case.

Are there aftermarket straps compatible with the 128349RBR-0051?

Yes. Any strap with a lug width of 20 millimetres is compatible with the 128349RBR-0051. A wide range of artisanal and industrial straps constructed for this width are available online. We recommend choosing superior-quality straps—alligator, vegetable-tanned calf, shell cordovan—to maintain the aesthetic value of your Rolex. Avoid faux leather straps or those constructed with loose tolerances.

How long does a leather strap last on a Rolex Day-Date 36?

A quality leather strap, worn daily, has an average lifespan of 3-5 years. Longevity depends on the tanning method (vegetable tanning offers superior durability through natural ageing), leather type (alligator and shell cordovan exceed calf), and exposure to moisture, perspiration and sunlight. A vegetable-tanned strap with moderate use can reach 7-10 years. To extend lifespan, avoid prolonged contact with water, swimming and showering, and apply reconditioning balm every 6-8 months.

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