Strap for Day-Date 36 White Gold Diamonds / President / Blue

The Rolex Day-Date 36, reference 118389-0108, features 20 mm lug width. This measurement is the standard for Day-Date models in 36 mm and is critical for compatibility with aftermarket straps and bracelets. To measure correctly, position a ruler perpendicular to the case from 12 o'clock to 6 o'clock, excluding the metal housing of the lug area: the result must be exactly 20 mm.

For a Day-Date 36 in 18 karat white gold such as the 118389-0108, genuine alligator represents the most noble choice: its natural grain and evolving patina over time convey timeless elegance. Italian box calf leather with vegetable tanning offers formal solidity and regular texture that refines with age. For versatile daily wear, shell cordovan from the finest American tanneries guarantees exceptional durability and natural lustre. Military-grade NATO fabric straps provide a sportive option, creating captivating aesthetic contrast with the precious metal.

Changing the Day-Date 36 strap requires a specific tool: the spring bar removal tool. Position the watch face-down on a soft surface, insert the tool beneath the metal lug (spring bar) with gentle movement, lift until the pin releases from the case groove, then remove the worn strap. To install the new one, align the pins with the case lug grooves and apply controlled pressure until you hear a click. If inexperienced, consult a professional: the risk is scratching the case.

Yes, completely. Any strap with 20 mm lug width is compatible with the Day-Date 36 reference 118389-0108. Ensure the strap does not present excessive thickness at the pin points (spring bar zones), otherwise it could create abnormal tension on the case lugs. High-quality artisanal straps—such as those in alligator, shell cordovan, or vegetable-tanned calf—guarantee correct manufacturing tolerances and prevent damage to the metal housing.

The lifespan of a leather strap depends on material quality, tanning method, frequency of use and environmental exposure. Premium-grade alligator with vegetable tanning can reach 5-7 years of daily wear before replacement, whilst developing a captivating patina. Shell cordovan, thanks to exceptional structural density, can exceed 10 years. A well-made Italian box calf resists 4-6 years. Critical factors are ambient humidity, prolonged direct sunlight exposure and perspiration: preventive care (periodic cleaning, avoiding moisture retention) significantly extends longevity. With Casati Milano, every strap comes with an 18-month warranty against manufacturing defects.