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

The Rolex Datejust 31 ref. 278343rbr-0020 has a lug width of 16mm. This measurement is taken between the inner walls of the lugs using a digital calliper, perpendicular to the strap axis. Any replacement strap must feature curved ends to conform correctly to the Oyster case profile.

For the Datejust 31 in yellow Rolesor, a vegetable-tanned alligator strap is the most coherent choice given the formal register of the watch: the natural grain develops a personal patina over time that complements the case's precious character. For more active contexts, box-grain calf leather or vulcanised rubber offer practical durability whilst maintaining an appropriate aesthetic. The correct width is 16mm with curved ends.

Replacing the strap on the Datejust 31 requires a spring bar tool or a 1mm flathead precision screwdriver to release the spring bars from inside the lugs. Place the case face-down on a protective cushion and work carefully to avoid scratching the polished surfaces. If in any doubt, consult a qualified watchmaker or the Casati Milano atelier.

Yes. The aftermarket offers 16mm straps with curved ends specifically designed for the Datejust 31 Oyster case. It is essential to verify the correct end curvature and material quality before purchase. Milano Straps offers handcrafted leather, rubber, and fabric straps at 16mm, made with finishes compatible with the original geometry of the 278343rbr-0020.

The lifespan of a leather strap depends on the material, tanning method, and daily use. A vegetable-tanned alligator strap, properly maintained — rotated with other straps, treated with a dedicated leather conditioner, and dried after moisture exposure — can last between three and seven years whilst retaining structural integrity and appearance. Box-calf straps have a comparable lifespan. The keeper loop and buckle hole are the primary wear points to monitor.