Rolex
Day-Date 36 118239-0124— lug 20mm

The lug width of the Rolex Day-Date 36 reference 118239-0124 is 20 millimetres. This measurement is critical for strap selection—it must align precisely with the space between the case lugs. No tolerance exists; a 19mm or 21mm strap will not fit.

For the white gold 118239-0124, alligator leather remains the classical and formal choice. Its natural grain texture contrasts elegantly with the case polish. Alternatively, vegetable-tanned calf offers tactile softness and a patina that evolves over time. Shell cordovan is ideal if you desire a dense, lustrous leather. Avoid sporty rubber straps—they contradict the presidential vocation of this model.

Changing the strap requires a spring bar tool and an appropriate watch holder. Remove the existing strap by extracting the spring bar pins from the lugs, then insert the new strap by aligning the holes with the lug pins. If you lack experience, consult a certified Rolex watchmaker or a strap specialist such as Casati Milano, which offers personalised consultation by appointment.

Yes, absolutely. A high-quality aftermarket strap (alligator, calf, shell cordovan) from a specialised manufacturer is fully compatible and often delivers superior aesthetic results compared to official Rolex bracelets. The critical requirement is that the lug width be exactly 20mm and the material reflect the formality of the model. Many collectors rotate multiple straps for seasonal variation.

Longevity depends on material and daily usage. A superior alligator strap lasts 3–5 years under normal wear; calf leather, slightly more vulnerable, 2–4 years; shell cordovan, denser, 4–6 years. Direct sunlight exposure, perspiration and humidity accelerate deterioration. Regular maintenance (application of appropriate creams every six months) extends lifespan. Casati Milano provides an 18-month warranty covering manufacturing defects.