Rolex
Day-Date 36 118139-0073— lug 20mm

The lug width of the Rolex Day-Date 36 118139-0073 is 20mm, measured shoulder-to-shoulder of the attachment lugs. This dimension is standard for the model and permits the use exclusively of straps designed for this width specification.

For the Day-Date 36 in white gold, alligator leather remains the most appropriate choice, particularly when vegetable-tanned to emphasize patina development over time. Fine calf leather is a contemporary alternative for those preferring uniform grain, whilst shell cordovan offers durability with deep patina formation. Avoid informal materials such as NATO and rubber, which contrast with the dress-watch vocation of the timepiece.

The procedure requires specialised tools: a spring bar tool and a protected work surface. Position the timepiece with the lugs facing upward, gently insert the tool's fulcrum beneath the attachment pin and push laterally to release the spring. Repeat on the opposite lug. Insert the new strap ensuring the spring orientation is correct (concavity facing downward) and verify the attachment before wearing.

Yes, provided it is manufactured for 20mm lug width. Milanostraps.it offers artisanal straps made to order with certified dimensional tolerances, guaranteeing perfect compatibility with Rolex lugs. Casati Milano, a bespoke atelier, additionally permits colour and material customisation directly in-house.

A quality leather strap, vegetable-tanned, typically lasts 4-6 years with moderate daily wear. Longevity depends upon environmental factors (humidity, solar exposure), frequency of use and maintenance. Semi-annual conditioning with natural oil extends service life to 8-10 years. Alligator leather ages more gracefully than calf or cordovan, developing aesthetic patina rather than accelerated degradation.