Rolex · Day-Date 40

Strap for Day-Date 40 Platinum - Baguette / Black

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

Lug width20 mm
Case diameter40 mm
Reference228396tbr-0024
FamilyDay-Date 40
MovementRolex caliber 3255 hours, minutes, seconds | date, day | chronometer
Year2018
CasePlatinum

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 40 228396tbr-0024

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Day-Date 40 228396tbr-0024, seen from the bench

The Day-Date was introduced in 1955 as the first wristwatch to display the day and date in full. It is powered by the automatic caliber 3255 with chronometer certification and a 70-hour power reserve. The 40mm case with 20mm lugs is available exclusively in precious metals.

Frequently asked questions

What is the lug width of the Rolex Day-Date 40 228396tbr-0024?

The Rolex Day-Date 40, reference 228396tbr-0024, features a lug width of 20 millimetres. This dimension must be measured precisely between the internal attachment pins of the case. It is essential to verify that the chosen strap explicitly indicates 20mm as the width, as even minor variations affect fitment and case compatibility.

Which strap is most suitable for the Rolex Day-Date 40 228396tbr-0024 in platinum?

For the 228396tbr-0024 in platinum, we recommend alligator in warm brown tones (cognac, chocolate, dark brown) which creates elegant contrast with the cold metal of the case. Alternatively, shell cordovan with natural patina offers superior durability and beauty that improves over time. Vegetable-tanned calf represents a balanced choice between formality and comfort, maintaining a refined and understated appearance.

How do you change the strap on a Rolex Day-Date 40?

Strap replacement requires a specific tool called a spring bar tool. Position the watch on a stable surface, insert the tool into the small slot next to the attachment pin, apply gentle pressure to release the internal spring, and slide out the old strap. Next, align the new strap beneath the pin and push gently until it clicks into place. If you are inexperienced, entrust the task to a professional watchmaker to avoid damage to the case.

Is an aftermarket strap compatible with the Rolex Day-Date 40 228396tbr-0024?

Yes, any strap with a 20mm lug width is compatible with the 228396tbr-0024, regardless of manufacturer. However, to ensure maximum quality and durability in line with Rolex standards, we recommend selecting artisanal strap makers who use premium leathers and refined finishes. Always verify that the width is certified exactly at 20mm.

What is the average lifespan of a leather strap on a Rolex Day-Date 40?

A premium leather strap (alligator, shell cordovan, vegetable-tanned calf) on a regularly worn timepiece typically lasts 3-5 years before replacement is necessary. Lifespan depends on sun exposure, humidity, frequency of use, and leather quality. Straps made with vegetable-tanned leathers age more elegantly, developing natural patina that enhances appearance over time. Periodic maintenance (gentle cleaning with a damp cloth) extends the useful life of the strap.

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