Rolex
Day-Date 36 118238-0473— lug 20mm

The Rolex Day-Date 36, reference 118238-0473, features a 20-millimetre lug width. This dimension is the result of Rolex's historical calibration for optimal visual proportions on a 36-millimetre case diameter. It is essential to verify the measurement with a digital calliper, positioning it perpendicular to the internal attachment points where the strap meets the case.

For a Rolex Day-Date 36 118238-0473 in yellow gold, alligator leather with vegetable tanning is the traditional choice: cognac or dark brown hues harmonise with the yellow metal. Shell cordovan offers a premium alternative for those seeking superior durability and a stratified patina over time. For a contemporary approach, calf leather with pronounced grain in Prussian blue or black creates elegant contrast without compromising formal aesthetics.

The Rolex Day-Date 36 118238-0473 features a President clasp with a three-crown crown that permits strap changes without tools. Position the wrist, press the crown laterally inward with moderate pressure, and the strap disengages from the lugs. The new strap is installed by reversing this procedure. Verify that the lug width is precisely 20 millimetres to prevent friction during insertion.

Any quality strap with a 20-millimetre lug width is compatible with the Day-Date 36 118238-0473. Milanostraps offers a specialised collection of 20mm straps in alligator, shell cordovan, calf, and technical rubber, with customisation available at Casati Milano's atelier. It is advisable to select straps with consistent thickness (1.4–1.8 millimetres) to avoid visual misalignment on the case.

A natural leather strap (alligator, shell cordovan, calf) on the Day-Date 36 typically lasts 5–8 years with daily use, depending on tanning method and maintenance. Shell cordovan, owing to its denser fibre, can exceed 10 years of service. Factors such as humidity, direct sunlight exposure, and frequency of strap changes influence longevity. The natural patina that develops is not deterioration but aesthetic evolution of the leather. Casati Milano provides an 18-month warranty on manufacturing defects and consultancy on preventive maintenance.