Rolex
Datejust 31 278289RBR-0028— lug 16mm

The Rolex Datejust 31 ref. 278289RBR-0028 has a lug width of 16mm. This measurement corresponds to the internal gap between the two lugs of the case and determines the exact width any replacement strap must have in order to fit correctly without forcing or lateral play.

For a white gold case with a diamond-set bezel, a vegetable-tanned alligator strap with belly grain is the most coherent choice: the symmetrical scale texture complements the preciousness of the metal. Alternatively, smooth box-calf leather or shell cordovan offer elegance with a more restrained register. A white gold deployant clasp completes the pairing impeccably.

To replace the bracelet or strap on the Datejust 31, a flat-tipped springbar tool is required to compress and remove the springbars housed within the lugs. Care must be taken not to scratch the white gold case: it is advisable to protect the case with low-tack masking tape or to entrust the operation to a watchmaker or the Casati Milano atelier.

Yes. The aftermarket offers 16mm-wide straps compatible with this reference in various materials — leather, alligator, rubber, NATO — provided the lug width is precisely 16mm. Milano Straps offers a curated selection of artisan-made 16mm straps, with options available for immediate dispatch or fully bespoke through the Casati Milano atelier.

The longevity of a leather strap depends on the quality of the tanning, frequency of wear, and exposure to perspiration and moisture. A high-quality vegetable-tanned alligator strap, rotated between several watches and regularly conditioned with a leather cream, can last between 3 and 6 years while developing a rich patina. Box-calf and shell cordovan follow similar timelines. Milano Straps provides an 18-month guarantee against manufacturing defects on all its straps.