Rolex
Day-Date 36 118135-0067— lug 20mm

The Rolex Day-Date 36 reference 118135-0067 features a lug width of exactly 20 millimetres. This measurement is the standard for the Day-Date 36 collection and represents the space where the strap attaches to the case lugs. To verify compatibility with an aftermarket strap, measure the available space on the case itself—not the width of the strap—as these are two distinct measurements.

For the 118135-0067 in Everose gold, alligator leather represents the historical and proportionally perfect choice. Alligator skin offers a regular, compact grain that underscores the watch's formal character, whilst its natural hardness ensures durability in daily-wear contexts. Shell cordovan is an alternative of excellence, developing a deep, three-dimensional patina over time. For less formal settings, vegetable-tanned calf or high-density technical textiles provide contemporary versatility while maintaining elegance.

Strap replacement requires specialist tools: a Rolex spring bar tool or dedicated lug-pin extractor. Position the watch on a padded support, open the lug collar on the case back using the spring bar tool, remove the lug pin with gentle movement, release the previous strap, and insert the new one—ensuring the 20mm width aligns with the case lugs. Reinsert the lug pin and fully close the collar. If inexperienced, consult a qualified watchmaker to avoid case scratching.

Any strap certified with a 20mm lug width is compatible with the 118135-0067. Bespoke leather straps—alligator, shell cordovan, calf—offer maximum aesthetic and constructive flexibility. Technical textile, FKM rubber, and suede straps with the same lug width operate in complete compatibility. Ensure the strap is designed for elegant watches of 36-38mm diameter to avoid unflattering proportions on the wrist.

A leather strap in alligator or premium hide with daily wear typically lasts 4-7 years operationally, depending on usage intensity and maintenance. Shell cordovan, being higher-density leather, may reach 8-10 years. Longevity decreases significantly in highly humid environments (40% reduction) or with frequent perspiration (20% reduction). Annual maintenance with specialist balms, regular drying, and periodic rotation between straps substantially extends operational lifespan. Casati Milano applies an 18-month warranty on manufacturing defects for bespoke straps.