Rolex
Day-Date 36 118238-0113— lug 20mm

The lug width of the Day-Date 36 118238-0113 is 20mm. This measurement is determined by the case geometry and represents the space between the two internal lug shoulders where the strap is inserted. Precise measurement using a digital calliper on the internal shoulders ensures perfect strap fit.

Nile alligator is the ideal choice: its fine grain and regular texture enhance the formal character of 18ct yellow gold whilst maintaining comfort on the wrist. Alternatively, box calf offers superior abrasion resistance, whilst shell cordovan develops a honey patina that evolves biologically over time, creating unique aesthetic continuity between the golden case and strap.

Use a dedicated spring bar tool, inserting the flat tip gently into the strap hole. Push laterally to decompress the internal spring pressure, allowing the pin to slide smoothly from the case lugs. Work methodically on all four attachment points: never force—the strap must move smoothly into position.

Yes, any strap with 20mm lug width is compatible. However, construction quality verification is essential: the Day-Date 36 demands proportionate strap keeper sizing, finishes coherent with yellow gold (yellow gold deployante if applicable), and tanning density guaranteeing long-term durability. Generic aftermarket straps risk premature play or degradation.

A quality artisanal alligator or shell cordovan strap lasts 4-6 years with daily wear, developing desirable patina over time. Box calf resists slightly longer (5-7 years) due to denser fibre structure. Longevity depends significantly on perspiration exposure, water contact and direct sunlight. Proper maintenance—timely drying, semi-annual conditioning with specialist balms—substantially extends strap lifespan.