Rolex
Datejust 31 278344RBR-0038— lug 16mm

The Rolex Datejust 31 ref. 278344RBR-0038 has a lug width of 16mm. This is a specific measurement for this midsize format, distinct from the 20mm of the Datejust 36 and the 13mm of the Lady-Datejust 28. To confirm the measurement on your own piece, we recommend verifying the internal distance between the lugs with a digital calliper.

For the Datejust 31 in two-tone white Rolesor with a diamond-set bezel, an alligator strap with vegetable tanning is the most coherent choice for formal occasions, as the natural grain complements the bezel's brilliance. Shell cordovan suits those who prefer a smooth, waxy surface. In both cases, a deployant clasp in steel or white gold is recommended to protect the lugs and extend the strap's service life.

To replace the strap on the Datejust 31, you need to remove the 16mm spring bars using a dedicated spring bar tool or a flat-head precision screwdriver. Work on a soft surface to protect the white gold lugs from scratches. If in doubt, it is advisable to entrust the operation to a professional watchmaker or visit the Casati Milano atelier.

Yes, high-quality aftermarket straps with a 16mm attachment are available and compatible with the Datejust 31. Milano Straps offers a curated selection of handcrafted straps in alligator, calf leather, shell cordovan and other materials, all made specifically for this lug width and finished to match the aesthetic standard of this timepiece.

The lifespan of a leather strap depends on the quality of the hide, the tanning process and daily use. A high-quality vegetable-tanned alligator strap, properly maintained — avoiding prolonged contact with water and perspiration and applying a conditioning cream periodically — can last between three and six years while retaining its structural integrity and developing a fine patina over time.