Rolex · Day-Date 36

Strap for Day-Date 36 Yellow Gold Diamonds / President / White

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
Reference118348-0070
FamilyDay-Date 36
MovementRolex caliber 3155 hours, minutes, seconds | date, day | chronometer
CaseYellow 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 118348-0070

Selected for the 20 mm lug width · workshop selection

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The Day-Date 36 118348-0070, seen from the bench

The Rolex Day-Date 36 118348-0070 is the first annual calendar automatic watch, launched in 1956, featuring the Rolex 3155 caliber with Parachrom escapement, Paraflex hairspring, and 48-hour power reserve. The 36mm case is crafted in 18K yellow gold with sapphire crystal and screw-down caseback. The lug width is 20mm, a specification critical for proper strap compatibility and visual proportion with the case design.

Frequently asked questions

What is the lug width of the Rolex Day-Date 36 118348-0070?

The Rolex Day-Date 36 118348-0070 features a lug width of 20 millimetres. This measurement is specific to the model and is essential for strap compatibility. Accurate measurement is performed using a digital calliper positioned between the inner shoulders of the case lugs, ensuring the aftermarket strap presents exactly 20mm width at the lug attachment point.

What is the best strap material for the Day-Date 36 in yellow 18K?

Alligator remains the classical choice: its natural texture with regular scales engages elegantly with the warmth of yellow gold without competing visually. Vegetable-tanned calf leather offers a contemporary alternative capable of patinating authentically over time. Shell cordovan represents a bold option—initially rigid, it softens whilst acquiring chromatic depth. The choice depends upon your intended daily usage and personal aesthetic preference.

How do I change the strap on the Rolex Day-Date 36 118348-0070?

Strap replacement requires a specialised tool to remove the spring bars anchoring the strap to the lugs. The process is straightforward: insert the flat end of the tool beneath the spring bar and lift gently until you feel the release click, then extract the strap. The operation is entirely reversible and presents no risk to the case when executed with care.

Are aftermarket straps compatible with the Day-Date 36 118348-0070?

Yes, any artisanal strap with a lug width of 20 millimetres is compatible with the 118348-0070. Verification that the width is precisely 20mm and that construction quality matches the watch's value is essential. A superior quality strap not only guarantees comfort but engages visually with the yellow gold case in harmonious dialogue.

What is the lifespan of a leather strap on a Rolex Day-Date 36?

Strap longevity depends upon frequency of use, chosen material, and maintenance. An alligator strap of superior quality may retain functional integrity for 5-7 years of daily wear. Vegetable-tanned calf tends to patinate more rapidly whilst maintaining structural integrity. Specific warranties—such as Casati Milano's 18-month guarantee against manufacturing defects—ensure reliability during the strap's initial 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.

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