Rolex
Day-Date 36 118138-0084— lug 20mm

The lug width of the Rolex Day-Date 36 118138-0084 is 20 millimetres. This measurement represents the distance between the two extremities of the lateral lugs and is the determining parameter for compatibility with any aftermarket strap. Measuring the lug width requires extraction of the lateral spring bars and the use of a calliper.

Alligator represents the historically coherent choice with the aesthetics of the 1950s Day-Date 36, offering a regular grain and natural softness. Shell cordovan proposes a profound and carnal texture, whilst vegetable-tanned calf leather generates a natural patina over time. Rubber or canvas straps are inadvisable, as they betray the constructive intentionality of the yellow gold case.

Strap replacement requires extraction of the lateral spring bars connecting the lugs to the case. Using a dedicated spring bar tool, carefully lift the internal retainers of the bars, extract them laterally, then insert the new strap. The operation must be performed with caution to avoid scratching the yellow gold case.

Yes, any strap with a 20mm lug width is physically compatible with the 118138-0084. However, aesthetic and constructive compatibility depends on material quality, buckle choice (obligatorily in precious metal) and chromatic coherence with the yellow gold case. A steel deployante or aluminium buckle betray the intentionality of the piece.

The longevity of a leather strap depends on frequency of use, climate conditions and craftsmanship quality. Under normal conditions, a premium-quality alligator or calf leather strap resists between 3 and 5 years. Vegetable tanning ages more visibly, generating a desirable patina. Casati Milano straps include a warranty on manufacturing defects for 18 months.