Rolex · Day-Date 36

Strap for Day-Date 36 Platinum Diamonds / President / Ice Blue Computer

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
Reference118346-0027
FamilyDay-Date 36
MovementRolex caliber 3155 hours, minutes, seconds | date, day | chronometer
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

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Straps for the Day-Date 36 118346-0027

Selected for the 20 mm lug width · workshop selection

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The Day-Date 36 118346-0027, seen from the bench

The Rolex Day-Date 36 Platinum Diamonds ref. 118346-0027 is a 36mm wristwatch introduced in 1956, the first timepiece to display both the full day and date simultaneously. The case is crafted from Rolex's exclusive 950 platinum alloy, featuring a diamond-set ice blue dial. It is powered by the Rolex caliber 3155, an automatic movement with variable inertia balance wheel, Parachrom antimagnetic hairspring, and COSC chronometer certification, offering approximately 48 hours of power reserve at 28,800 vph. The platinum President bracelet features semi-rigid three-part links, though many collectors opt for custom straps with a 20mm lug width. Water resistance is rated to 100 metres.

Frequently asked questions

What is the lug width of the Rolex Day-Date 36 118346-0027?

The Rolex Day-Date 36 reference 118346-0027 has a lug width of 20mm. This measurement is standard across the entire Day-Date 36 family and should be verified with a digital calliper placed inside the lugs before purchasing an aftermarket strap.

What is the best strap for the Rolex Day-Date 36 in platinum?

For a platinum 950 Day-Date 36, a vegetable-tanned alligator strap with belly grain is the most coherent choice given the watch's formal character. Alternatively, shell cordovan offers a dense texture and deep reflections that complement the cold neutrality of platinum. For less formal settings, polished box-calf leather is an elegant and versatile option.

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

To replace the strap on a Rolex Day-Date 36, the spring bars must be removed using a thin-bladed spring bar tool. It is advisable to work on a soft surface to protect the platinum lugs from scratches. If you are not experienced with this operation, it is preferable to consult a watchmaker or visit the Casati Milano atelier.

Are there aftermarket straps compatible with the Rolex Day-Date 36 118346-0027?

Yes, there are numerous aftermarket straps compatible with the Rolex Day-Date 36 at 20mm lug width. It is important to select straps with ends suited to the geometry of the Day-Date lugs, ideally with a compatible curve. Milanostraps.it offers a selection of handcrafted 20mm straps made from fine leathers with high-quality finishes.

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 saddle stitching and wax finish can last between three and six years with regular wear. Shell cordovan, owing to its dense fibrous structure, tends to last longer, developing a characteristic patina over time. Avoiding prolonged contact with water and perspiration significantly extends the strap's life.

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