Rolex
Day-Date 36 118389-0101— lug 20mm

The lug width (ansa) of the Rolex Day-Date 36 118389-0101 is 20mm, measured centre-to-centre between the two attachment pins on the case. This dimension is standard for all President-line Day-Date models and guarantees perfect compatibility with straps calibrated to this specification.

For the 118389-0101 in white gold, alligator leather with vegetable tanning represents the classical choice: the reptile's natural grain does not compete with gold's lustre, but emphasises it. Shell cordovan is the alternative for those seeking tactile density and natural lustre. Satin-finished calf leather is the modern solution for constructive coherence and durability.

The strap is removed using a spring bar tool, positioning the forked end on the pin's lateral groove and gently pressing downward. The internal spring releases and the pin disengages from the case. Insert the new strap by sliding the pin through the lugs until it locks into place with an audible click.

Yes, any strap calibrated to a 20mm lug width is mechanically compatible with the 118389-0101. For aesthetic coherence and longevity, we recommend superior leather quality (alligator, shell cordovan) and finishes that dialogue with white gold, such as deployante clasps in precious metal.

A high-quality leather strap (alligator or cordovan with vegetable tanning) on a Rolex Day-Date 36 under moderate use typically lasts 3-5 years. Durability depends on humidity exposure, frequency of use and maintenance. Casati Milano guarantees 18 months against manufacturing defects; beyond this period, natural leather wear is predictable.