Strap for Day-Date 36 Yellow Gold Diamonds / President / MOP

The lug width of the Rolex Day-Date 36 118388-0018 is 20 millimetres. This measurement refers to the distance between the inner holes of the upper and lower lugs on the Oyster case. It is crucial to measure with precision using a digital calliper or flexible tape on a bare wrist, excluding the case entirely, to ensure aftermarket strap compatibility.

For the Day-Date 36 in yellow gold, alligator remains the primary choice: its natural herringbone texture and light-play on the leather absorbs luminosity, creating elegant contrast with the gold. Alternatively, shell cordovan—equine leather from vegetable tannage—develops deep patina and maintains natural durability. Vegetable-tanned calf offers superior wrist softness and develops amber tones that dialogue with the yellow gold over time.

The Day-Date 36 strap is changed using a spring bar removal tool that allows access to the internal spring pins of the lugs. Position the tool in the small lateral hole of the lug, push downward to compress the spring, and slide the strap out of the lug. To fit the new 20mm strap, insert the spring pin into the corresponding hole and slide the strap until the spring clicks into position. If inexperienced, Casati Milano offers in-atelier strap-change service with personalised consultation.

Any strap with 20mm lug width is compatible with the Day-Date 36 118388-0018. On milanostraps.it, the 20mm strap collection comprises alligator, shell cordovan, vegetable-tanned calf, FKM rubber and silicone rubber in various colours and finishes. Always verify the 20mm lug-width code in the product description before purchase.

A natural leather strap—alligator, shell cordovan or vegetable-tanned calf—on a Rolex Day-Date 36 has an average lifespan of 4–7 years with daily wear, provided proper maintenance. Alligator and shell cordovan, being denser leathers, tend to outlast soft calf. Prolonged exposure to perspiration, humidity and UV rays reduces lifespan; periodic maintenance with specialist balms extends useful life. Casati Milano provides an 18-month warranty against manufacturing defects on every commissioned strap.