Rolex · Day-Date 36

Strap for Day-Date 36 Yellow Gold Diamonds / President / Lavender Jade Carousel

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
Reference118388-0161
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 118388-0161

Selected for the 20 mm lug width · workshop selection

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The Day-Date 36 118388-0161, seen from the bench

The Day-Date was introduced in 1955 as the first wristwatch to display the day and date. It is equipped with the automatic Caliber 3155 with chronometer certification and functions of hours, minutes, seconds, date and day. 36mm case with 20mm lugs, available exclusively in precious metals.

Frequently asked questions

What is the lug width of the Rolex Day-Date 36 118388-0161?

The Rolex Day-Date 36 118388-0161 features a standard lug width of 20 mm. This measurement refers to the internal distance between the lugs, taken at the base of the case with a calliper. Any aftermarket strap with straight ends in 20 mm width is compatible without modification.

What is the best strap for the Rolex Day-Date 36 118388-0161?

For an 18-carat yellow gold case such as that of the Day-Date 36, the most appropriate materials are Louisiana alligator in cognac or burgundy tones and box-calf leather with vegetable tanning. Both develop an authentic patina over time and pair cohesively with gold. For more casual or sporting contexts, vulcanised FKM rubber is a practical and long-lasting alternative.

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

The strap on the Rolex Day-Date 36 is removed using a dedicated spring bar tool or a precision screwdriver to release the spring bars connecting the strap to the lugs. It is advisable to work on a soft mat to avoid scratching the gold case. The operation takes approximately two minutes and requires no specialist watchmaking assistance.

Are there aftermarket straps compatible with the Rolex Day-Date 36 118388-0161?

Yes. Any strap with a 20 mm lug width and straight ends is compatible with the Rolex Day-Date 36 118388-0161. Milano Straps offers a curated selection of handcrafted straps in alligator, calf leather, shell cordovan and rubber, manufactured to precise dimensions for an optimal fit without any alteration to the original lugs.

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

The lifespan of a leather strap depends on the quality of the hide, frequency of use, and exposure to perspiration and environmental conditions. A high-quality alligator or shell cordovan strap with vegetable tanning can last between three and seven years with standard care: avoiding prolonged water contact, rotating between multiple straps, and applying a neutral leather conditioner periodically will significantly extend the life of the piece.

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