Strap for Datejust 31 Stainless Steel / Yellow Gold / Domed - Diamond / Grey - Roman / Jubilee

The lug width of the Rolex Datejust 31 278343rbr-0018 is 16mm. This dimension is determined by the geometry of the 31mm case and must be respected rigorously to ensure correct fit of the strap to the spring bar attachments, without lateral play or visual misalignment.

For the two-tone gold/steel 278343rbr-0018, alligator leather with vegetable tanning represents aesthetic excellence: the natural grain enhances the two-tone case's lustre, while the patina develops warm tones over time. Shell cordovan is ideal for formal occasions, European calf for daily versatility, rubber for dynamic urban contexts.

Strap replacement requires extraction of the spring bars using a specialized tool (spring bar remover). It is advisable to entrust this to an expert to avoid case damage. Casati Milano offers this service in their atelier and can guide the process via WhatsApp for remote clients.

All straps with 16mm lug width are compatible with the 278343rbr-0018. Rolex models such as the Submariner 41, GMT-Master II, and Yacht-Master share this same lug width, broadening the range of available aftermarket personalisation options.

A high-quality alligator or calf strap with vegetable tanning has a lifespan of 4-6 years with daily use, variable depending on humidity, temperature, and maintenance. Rubber has similar durability but is less affected by humidity. Periodic restoration extends the functional and aesthetic life of the strap.