Rolex
Datejust 31 278383rbr-0017— lug 16mm

The lug width of the Rolex Datejust 31 reference 278383rbr-0017 is 16mm. This measurement should be taken with a calliper between the two lugs at the point where the strap attaches to the case, ensuring a precise fit with no lateral play.

For the yellow Rolesor Datejust 31, a glossy alligator strap in bordeaux or dark brown enhances the formal character of the diamond-set bezel. Vegetable-tanned calf leather in cognac or navy is the most versatile choice for daily wear, while black vulcanised rubber is ideal for sporting or summer use. All straps must feature a 16mm lug width.

To replace the strap on a Datejust 31, you will need a dedicated springbar tool — a fine-tipped instrument that compresses the springbars housed within the case lugs. The operation must be carried out with care to avoid scratching the steel or gold surfaces. If in doubt, it is advisable to consult a watchmaker or a specialist atelier such as Casati Milano.

Yes. Aftermarket straps compatible with this reference must have a lug width of 16mm. Milano Straps offers a curated selection of handcrafted straps in alligator, calf leather, shell cordovan, NATO fabric, and rubber, all manufactured to precise dimensional specifications ensuring compatibility with the 31mm Oyster case.

The lifespan of a leather strap depends on leather quality, frequency of wear, and maintenance. A high-quality alligator or shell cordovan strap, kept away from excessive moisture and perspiration and rotated with at least one other strap, can last between three and six years whilst retaining its shape and texture. Vegetable-tanned calf straps develop a patina over time but tend to show wear earlier at the keeper and buckle hole.