Rolex
Day-Date 36 118388-0159— lug 20mm

The lug width of the Rolex Day-Date 36 118388-0159 is 20 millimetres. This dimension is determined by the distance between the inner shoulders of the attachment lugs on the case. It is a fixed constructive specification and ensures that only straps designed for this lug width will fit correctly without play or stress on the lugs.

Alligator remains the most elegant solution for the yellow gold Day-Date 36: the natural scute pattern harmonises with the metal without competing in brightness. Recommended shades are taupe brown, medium brown with mahogany undertone, and deep navy blue. Vegetable-tanned calf leather is a substantial alternative for those who appreciate how patina evolves over time.

The strap is attached via lugs that pass through the lug slots on the case. Using a spring bar tool, you gently compress the small internal hooks of the lug to extract it from the attachment holes. After removing the old strap, insert the new one by reversing the procedure, ensuring the lugs are perfectly seated in their holes.

Yes, any strap manufactured for a 20-millimetre lug width is compatible with the Day-Date 36 118388-0159. Compatibility depends exclusively on lug width, not on the strap manufacturer. A quality handcrafted strap, such as those made by Casati Milano to specification, often provides superior fit and finishing compared to OEM straps.

The lifespan of a full-grain leather strap varies between 2 and 4 years under daily wear conditions, depending on leather quality, tanning method applied, and exposure to humidity, heat and perspiration. High-quality alligator tends to last longer than common calf. Periodic maintenance, such as gentle cleaning and leather conditioning, significantly extends longevity.