Rolex
Day-Date 36 118388-0112— lug 20mm

The lug width of the Day-Date 36, reference 118388-0112, is 20 millimetres. This measurement is the distance between the two lugs (strap attachment points) on the case. Verifying this dimension is essential when purchasing an aftermarket strap to ensure complete compatibility and proper visual proportions between the case and bracelet.

For the Day-Date 36 in yellow gold, alligator leather remains the contemporary choice par excellence, offering a regular grain structure and chromatic dialogue with the gold case. Shell cordovan provides a deep patina that evolves with the watch. Vegetable-tanned calf delivers a more polished, monochromatic surface. For daily wear, rubber with fine-grain texture combines practicality with formal discretion. Your choice depends on personal style and predominant occasions of use.

To change the strap, you need a spring bar tool (specialised instrument) to disengage the metallic posts that secure the strap to the case lugs. Position the watch on a stable surface, insert the flat tip of the tool into the spring bar slot, apply gentle pressure to retract the post, then remove the old strap. Align the new strap holes with the case attachments and allow the spring bar to lock automatically. If uncertain, Casati Milano offers professional fitting service.

Absolutely. An aftermarket strap crafted by specialists in premium leathers—alligator, shell cordovan, or vegetable-tanned calf—does not compromise the watch's value or functionality. Conversely, it allows you to personalise your Day-Date 36 according to your style and occasions. The 20-millimetre width ensures complete compatibility with the case lugs. Choosing a reputable manufacturer guarantees durability and professional finishing.

Leather strap longevity depends on material type, frequency of use, and environmental exposure. High-quality artisan alligator maintains structural integrity for 5–8 years of daily wear, developing characteristic patina. Shell cordovan can last 10–12 years owing to superior fibre density. Calf typically requires regular maintenance and averages 4–6 years. Rubber exhibits the greatest durability (10+ years) but with less aesthetic evolution. Factors such as perspiration, sunlight exposure, and humidity fluctuations accelerate the natural ageing of leather, which remains an integral part of these organic materials' beauty.