Rolex · Day-Date 36

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

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-0048 (aka: m128349rbr-0048)
FamilyDay-Date 36
MovementRolex caliber 3255 hours, minutes, seconds | date, day | chronometer
Year2024
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

All Rolex spring barsOpen →

Straps for the Day-Date 36 128349RBR-0048 (aka: m128349rbr-0048)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Day-Date 36 128349RBR-0048 (aka: m128349rbr-0048), seen from the bench

The Rolex Day-Date 36 128349RBR-0048 features a 36mm white gold case housing the Rolex Caliber 3255 chronometer-certified movement. The lug width is 20mm, specific to this 36mm format. The case, 12.9mm thick, houses an internal perpetual movement with a sapphire crystal and Twinlock crown offering 100-meter water resistance. The dial presents applied indices and hands designed for optimal readability. As the first calendar chronograph with day and date windows introduced sixty years ago, this model remains a symbol of refined elegance in the President collection.

Frequently asked questions

What is the lug width of the Rolex Day-Date 36 128349RBR-0048?

The lug width is precisely 20 millimetres. This measurement represents the distance between the case attachment pins and is specific to the 36mm Day-Date format. Always verify this dimension before purchasing a replacement strap to ensure compatibility with your case.

What is the best strap for the Day-Date 36 128349RBR-0048?

For a white gold 18-carat Rolex Day-Date, we recommend fine-grained alligator in dark brown or shell cordovan for formal wear, or calf leather with vegetable tanning for daily versatility. Your choice depends on intended use and desired level of personalisation. All straps must respect the 20mm lug width and feature a robust deployant clasp.

How do I change the strap on the Rolex Day-Date 36 128349RBR-0048?

Strap replacement requires a specific tool to remove the attachment pins (spring bar tool). Insert the tool into the small hole beneath the case, push inward to release the pin spring, extract it carefully, and repeat on the opposite side. To install the new strap, align the holes and insert the pin until it clicks. If inexperienced, consult a certified watchmaker.

Which aftermarket straps are compatible with the 128349RBR-0048?

Any strap with a 20mm lug width is compatible. We recommend straps with integrated Rolex-compatible deployant clasps, crafted in alligator, shell cordovan, vegetable-tanned calf, or FKM rubber of horlogerie quality. Always verify that the strap is designed for the correct measurement and features adequate thickness for the white gold case.

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

A quality leather strap (alligator, shell cordovan, vegetable-tanned calf) typically lasts 3–5 years with daily wear, depending on exposure to light, perspiration, and humidity. Longevity varies by material: shell cordovan resists atmospheric agents better, whilst fine alligator is more delicate but exceptionally elegant. Casati Milano guarantees 18 months against manufacturing defects on artisanal straps.

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