Rolex · Day-Date 36

Strap for Day-Date 36 Yellow Gold Diamonds / President Diamonds / Bull's Eye

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
Reference118388-0128
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

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Straps for the Day-Date 36 118388-0128

Selected for the 20 mm lug width · workshop selection

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The Day-Date 36 118388-0128, seen from the bench

The Rolex Day-Date 36 ref. 118388-0128 is a yellow gold automatic chronometer watch introduced in 1956 as the world's first watch displaying the full day of the week. The 36 mm yellow gold case houses the caliber Rolex 3155 automatic movement with approximately 48 hours power reserve and COSC certification, accurate to ±2 seconds per day. The bezel features brilliant-cut diamond pavé setting. The strap lug width is 20 mm, compatible with standard 20 mm watch straps for customization while maintaining the original structure.

Frequently asked questions

What is the lug width of the Rolex Day-Date 36 118388-0128?

The Rolex Day-Date 36 118388-0128 has a lug width of 20 mm, measured between the inner walls of the lugs. This is the key measurement required when selecting any compatible aftermarket strap.

What is the best strap for the Rolex Day-Date 36 118388-0128?

For the Day-Date 36 118388-0128 in yellow gold, a hornback alligator strap in black or midnight blue paired with a gold-tone deployant clasp is the most technically coherent choice for the watch's aesthetic register. Shell cordovan in burgundy is an equally refined alternative, developing a warm patina that complements yellow gold over time.

How do you change the strap on a Rolex Day-Date 36 118388-0128?

Replacing the strap on the Day-Date 36 118388-0128 requires a double-headed springbar tool to release the spring bars from the lugs. Given the solid 18-carat yellow gold construction, using a tool fitted with a nylon tip guard is strongly recommended to prevent scratches on the polished surfaces. The operation can be carried out independently with care, or entrusted to a watchmaker or the Casati Milano atelier.

Are there aftermarket straps compatible with the Rolex Day-Date 36 118388-0128?

Yes. Any strap with a 20 mm attachment width is technically compatible with the Day-Date 36 118388-0128. For yellow gold lugs with a slightly curved profile, straps with straight or gently tapered ends are preferred for a proper fit. Milanostraps.it offers a curated selection of handcrafted 20 mm straps in alligator, vegetable-tanned calf and shell cordovan, all compatible with this reference.

How long does a leather strap last on a Rolex Day-Date 36 118388-0128?

The longevity of a leather strap depends on the tanning quality, daily care and exposure to moisture and perspiration. A high-quality alligator or shell cordovan strap, worn regularly and kept away from water, will retain its structural and aesthetic qualities for 3 to 5 years. Casati Milano's artisan straps carry an 18-month warranty against manufacturing defects.

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