Rolex
Day-Date 36 118239-0281— lug 20mm

The lug width is exactly 20 millimetres. This dimension is specific to the Day-Date 36 and does not correspond to the 18 mm lugs (standard Datejust 36) or 22 mm lugs (Day-Date 40). Precision in fitting is critical to prevent the strap from shifting laterally on the case lugs.

For this white gold reference, vegetable-tanned calf leather (in dark burgundy or hazel tones) and alligator (in black or dark blue) represent the most balanced choices aesthetically and functionally. Dark red calf develops a rich amber patina over time, whilst alligator maintains a smooth surface. The choice depends on intended use: fully formal contexts suggest black or navy blue; semi-formal occasions permit dark brown or burgundy.

The strap is secured to the case via two lugs: one threaded (dial side) and one smooth (caseback side). Using a specialist spring bar tool, push the smooth pin laterally inward whilst simultaneously lifting the strap. Once the old strap is removed, insert the new one by leveraging on the threaded pin until it clicks into place. It is advisable to entrust this operation to a professional to avoid damage to the lugs.

Yes. A bespoke 20 mm strap is entirely compatible with the Day-Date 36. The quality of the aesthetic result depends on strap construction: the lug ends must present curves that naturally follow the slightly convex shape of the Rolex lug, and the keeper must adhere snugly to the case without play. Straps constructed bespoke by specialised ateliers guarantee precise fitting and superior longevity.

A vegetable-tanned calf strap, subject to minimal maintenance (application of specialist balm every 12–18 months), has an average lifespan of 8–12 years under daily use. Alligator tends to last longer as exotic leather has superior fibre density. Actual durability depends on environmental factors (humidity, solar exposure) and usage habits. A strap stored carefully and not subject to excessive mechanical stress can easily exceed a decade without visible degradation.