Technical Archive

Rolex
Day-Date 36 128239-0029— lug 20mm

Rolex Day-Date 36 128239-0029: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Day-Date 36 White Gold / Fluted / Blue Ombré-Diamond / President-Diamond

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

Rolex 128239-0029
Lug Width
20 mm

The essential strap measurement.

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Reference

128239-0029

Movement

Rolex caliber 3255 Hours, Minutes, Seconds | Date, Day | Chronometer

The Heritage

The Rolex Day-Date 36 reference 128239-0029 features a 36mm white gold case with fluted bezel and lacquered blue ombré-diamond dial, establishing the original presidential watch design since 1956. The watch houses the Rolex Caliber 3255, a COSC-certified chronometer movement with 70-hour power reserve and Chronergy escapement in nickel-phosphorus. Day and date display via Cyclops lens at 12 and 3 o'clock respectively. Lug width is 20mm, compatible with aftermarket straps and bracelets.

FAQ

What is the lug width of the Rolex Day-Date 36 128239-0029?

The lug width of the Rolex Day-Date 36 128239-0029 is 20mm. This measurement is standard across the entire Day-Date 36 family and is taken with a digital calliper in the space between the two parallel lugs at the strap attachment point on the case.

What is the best strap for the Rolex Day-Date 36 128239-0029 in white gold?

For the Day-Date 36 in white gold, the most suitable materials are alligator in anthracite or midnight blue tones, creating an elegant contrast with the case, and shell cordovan for those seeking a compact texture that improves with wear. A deployant clasp in steel or white gold PVD completes the look in a manner consistent with the timepiece's standing.

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

To replace the bracelet or strap on the Day-Date 36, the spring bars must be removed from the lugs using a dedicated spring bar tool or a flat-head precision screwdriver. It is advisable to rest the watch on a soft surface to protect the white gold case. The operation takes only a few minutes and does not require a watchmaker's intervention.

Are there aftermarket straps compatible with the Rolex Day-Date 36 128239-0029?

Yes, there are many aftermarket straps compatible with the Rolex Day-Date 36 128239-0029. The key parameter is the 20mm lug width. Milano Straps offers a selection of handcrafted straps in alligator, vegetable-tanned calf leather and shell cordovan, with bespoke buckles and deployant clasps, all compatible with this reference.

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

The lifespan of a leather strap depends on the material, frequency of use and maintenance. A quality alligator strap, with daily use, retains its structural and aesthetic integrity for 2 to 4 years. Shell cordovan, thanks to its dense fibre structure, can last considerably longer whilst developing a personal patina. Prolonged exposure to water and perspiration should be avoided, and the strap should be allowed to dry between wearings.

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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