Rolex
Datejust 31 278384rbr-0028— lug 16mm

The lug width of the Rolex Datejust 31 ref. 278384rbr-0028 is 16mm. This measurement refers to the internal distance between the case lugs and is the key parameter for selecting a compatible strap. The lugs feature an internal curve that requires straps with appropriately shaped ends or high-quality flat ends for a proper fit.

For the Datejust 31 in white Rolesor with a diamond-set bezel, a domed alligator strap is the most aesthetically coherent choice: the scale texture complements the case finishing, and a deployant clasp in white gold maintains metallic consistency. Alternatively, vegetable-tanned calf leather or shell cordovan offer character and durability for more everyday wear.

Replacing the strap on the Datejust 31 requires a spring bar tool — a fine-tipped instrument used to compress and remove the spring bars housed within the lugs. The operation requires care to avoid scratching the white gold or steel case. It is advisable to have the work carried out by a qualified watchmaker or through the Casati Milano atelier service, where professional tools are used.

Yes. The aftermarket offers 16mm straps compatible with the Datejust 31, provided they respect the curved lug geometry of the model. Milanostraps.it offers a curated selection of handcrafted 16mm straps — in leather, rubber, and nylon — made from premium materials and dimensionally tested for compatibility with this Rolex reference.

The lifespan of a leather strap depends on the material, maintenance, and frequency of use. A quality alligator strap, kept away from excessive moisture and perspiration and stored correctly, can last between three and seven years. Vegetable-tanned calf leather develops a patina over time and, with proper care, easily exceeds four to five years. Shell cordovan, due to the density of its fibres, is among the most resilient materials and can accompany the watch for a decade or more.