Strap for Day-Date 36 Yellow Gold Fluted / President Diamond / Paved Roman

The lug width of the Rolex Day-Date 36 118238-0123 is 20 mm. This measurement determines compatibility with any aftermarket strap. To verify, measure the internal space between the two lugs on the case: it should measure exactly 20 millimetres. This standardisation ensures that any certified 20 mm strap will fit perfectly to your lugs without gaps or protrusions.

For a Day-Date 36 in yellow gold (118238-0123), alligator remains the traditional and preferable choice. An alligator strap in brown or black, 4 mm thickness, with a yellow gold deployant buckle creates unmatched aesthetic harmony. Alternatively, superior quality calf leather with vegetable tanning offers uniform texture and tactile softness, ideal for daily wear. Shell cordovan, from the horse's back, develops a caramelised patina over time and is perfect if you wish your strap to age gracefully alongside the watch.

Changing the strap on a Rolex Day-Date 36 requires a spring bar tool (flat-ended lever). Place the watch on a soft surface, locate the small hole hidden beneath the lug, gently insert the tool until the internal spring retracts, extract the spring bar, and repeat on the opposite lug. Reverse the procedure to mount your new strap. If you lack experience, we recommend entrusting this task to a jeweller or Casati Milano, which performs strap changes by appointment with absolute precision.

Yes, any aftermarket strap certified with 20 mm lug width is compatible with your 118238-0123. Rolex standardisation ensures that lugs have remained identical for decades. However, we recommend choosing superior quality materials: natural alligator, calf leather with vegetable tanning, or shell cordovan. These materials guarantee longevity, comfort, and aesthetic evolution over time that reflects the watch's value. Avoid synthetics and low-quality rubber that deteriorate rapidly.

A superior quality leather strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 3–5 years of daily wear before showing visible deterioration. Longevity depends on: frequency of wear, sun and humidity exposure, care and maintenance. An occasionally worn strap may last 7–10 years. Leather ages naturally, developing patina and fine creases, which are signs of beauty, not defect. If you wish your Day-Date to maintain immaculate appearance, we recommend rotating between 2–3 straps and storing them in dry environments. Casati Milano offers an 18-month warranty on manufacturing defects on all custom straps.