Rolex
Day-Date 36 118348-0194— lug 20mm

The lug width of the Rolex Day-Date 36 118348-0194 is 20 millimetres. This specific measurement is determined by the distance between the two spring bars protruding from the case. Any compatible strap must mount on exactly 20mm spring bars to ensure a precise fit without play or stress on the yellow gold case.

For the Day-Date 36 in yellow gold, dark brown or black alligator remains the classic choice: its regular grain and natural lustre accord perfectly with the warm patina of 18-carat gold. Valid alternatives include vegetable-tanned calf (for chromatic evolution over time) and shell cordovan (for durability and character development). The choice depends on use context and personal preference for leather evolution.

Strap replacement requires a spring bar removal tool. Position the watch with lugs facing upward, locate the small hole on the spring bar, insert the removal tool to compress the internal spring slightly and slide the bar outward. Repeat on the opposite lug, then insert the new spring bar (20mm) aligning it with the case holes. If inexperienced, entrust the operation to a professional watchmaker.

Yes, provided the lug width is exactly 20 millimetres and the spring bars are engineered for non-invasive mounting on the yellow gold case. An artisanal strap crafted by a specialist atelier (such as Casati Milano) can match or exceed the quality of the original Rolex strap in terms of leather selection, edge finishing and buckle construction. Technical compatibility remains the critical factor.

A well-crafted leather strap maintains structural and aesthetic integrity for 3–5 years of daily wear, variable according to climate, frequency of use and maintenance. Alligator tends to last longer than shell cordovan, which develops a more fascinating patina. Protecting the strap from excessive moisture and direct heat sources significantly prolongs useful life. An artisanal strap with 18-month warranty covers manufacturing defects.