Strap for Day-Date 36 White Gold Diamonds / President Diamond / Paved

The lug width of the Rolex Day-Date 36 118389-0020 is 20 millimetres. This measurement refers to the internal distance between the horizontal attachment pins on the case. Any aftermarket strap must respect a tolerance of ±0.5 millimetres to prevent instability or detachment.

Alligator is the classical choice, as its fine grain emphasises the luminosity of white gold. However, vegetable-tanned calf leather develops richer patina over time, whilst shell cordovan guarantees a distinctive gloss finish. The choice depends on context: formal (alligator), mixed (calf), evening wear (shell cordovan).

Strap replacement requires a spring bar remover tool to extract the elastic pins from the lugs. Insert the tool from underneath the case to release the pin, remove the old strap and insert the new one. We recommend having the operation performed by a qualified watchmaker to avoid scratching the case.

Yes, any strap with a 20mm lug width is compatible. However, verify that the external width of the buckle harmonises visually with the 36mm case diameter. An oversized deployante would appear disproportionate. Casati Milano straps are specifically designed for this proportion.

A quality artisanal alligator strap lasts 3-5 years with daily wear, accounting for the humidity-dryness cycles typical of Central Europe. Shell cordovan resists longer (5-7 years), whilst vegetable-tanned calf requires more frequent maintenance but develops desirable patina. Durability also depends on perspiration composition and sun exposure.