Rolex · Day-Date 36

Strap for Rolex Day-Date 36 128399TBR

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
Reference128399TBR
FamilyDay-Date 36
MovementRolex caliber 3255 Hours, Minutes, Seconds | Date, Day | Chronometer

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 128399TBR

Selected for the 20 mm lug width · workshop selection

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The Day-Date 36 128399TBR, seen from the bench

The Day-Date was introduced in 1956 as the first wristwatch to display the date and day of the week simultaneously. It is powered by the automatic Caliber 3255 with chronometer certification and features hours, minutes, seconds, date, and day. The 36mm case is crafted in white gold with 20mm lugs.

Frequently asked questions

What is the lug width of the Rolex Day-Date 36 128399TBR?

The lug width of the Rolex Day-Date 36 128399TBR is 20 millimetres. This measurement represents the distance between the two attachment holes on the case. Always verify this dimension before purchasing an aftermarket strap to ensure perfect compatibility with your timepiece.

Which strap is most suitable for the Rolex Day-Date 36 128399TBR?

For the Day-Date 36 128399TBR in white gold with diamond-set bezel, alligator leather in vegetable tanning is the most elegant choice. The distinctive grain of alligator enhances the white gold without competing with the pavé setting. Alternatively, shell cordovan in bordeaux tones or black calf leather offer versatility whilst maintaining the model's formality.

How do I change the strap on the Rolex Day-Date 36 128399TBR?

Strap replacement requires a dedicated spring bar tool. Position the watch with the lugs facing upward, gently insert the tool into the lateral slot of the bar to compress the internal spring, extract the pin, and repeat on the opposite side. Install the new strap by reversing the procedure. If uncertain, consult a professional.

Can I use compatible aftermarket straps on my 128399TBR?

Yes, you may use certified quality aftermarket straps, provided they respect the 20-millimetre lug width specification. Premium artisanal straps in alligator, cordovan, or high-grade calf leather offer construction quality and durability comparable to original Rolex straps, with the advantage of complete personalisation.

How long does a leather strap last on a Rolex Day-Date 36 128399TBR?

A quality leather strap, if properly maintained, lasts between 3 to 7 years depending on daily usage and storage conditions. Vegetable-tanned leather ages naturally, developing a patina over time. Shell cordovan, due to its intrinsic density, typically lasts longer than calf leather. With warranty coverage on manufacturing defects, a Milanese artisanal strap ensures reliability for 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