Rolex
Day-Date 36 118346-0084— lug 20mm

The Day-Date 36 lug width measures precisely 20 millimetres. This specification is standard for the model and must be respected rigorously when selecting an aftermarket strap. You can verify it by positioning a digital calliper perpendicular to the lug shoulders at the point of strap attachment.

Alligator remains the natural choice: the regular texture of the scutes dialogues perfectly with the Day-Date's geometry, and the patina develops nobly over time. Quality calf leather with vegetable tanning offers a softer feel and superior adaptability; shell cordovan represents an extremely robust alternative with a deep brown-reddish patina that develops with age.

The Day-Date uses a standard 20mm spring bar system. A small dedicated tool (spring bar tool) is required to gently push inward the retention mechanism and extract the old strap. We recommend consulting an expert or certified watchmaker to avoid damage to the case.

Yes. A quality aftermarket strap must be constructed specifically for the 20mm lug width with precise tolerances. The finest examples are crafted from alligator or calf leather by specialised European suppliers, featuring hand-stitched construction and professional finishing. Avoid generic straps: compatibility is critical for wearing security.

A strap in excellent-quality alligator or vegetable-tanned calf leather typically lasts between 4 and 8 years with daily wear, depending on exposure to water and sunlight. Shell cordovan, owing to its intrinsic density, can endure 10–12 years. Regular maintenance—gentle cleaning and protection from humidity—substantially extends the strap's lifespan.