Rolex
Datejust 31 278275-0025— lug 16mm

The Rolex Datejust 31 reference 278275-0025 has a lug width of 16mm. This is a non-standard size compared to the more common 18-20mm range, so it is essential to measure the internal distance between the lugs with a calliper before purchasing an aftermarket strap.

For an Everose gold case measuring 31mm, a vegetable-tanned alligator strap with a bombé profile is the most coherent sartorial choice: the scale grain interacts with the texture of the fluted bezel, and the warm leather tone complements the rose gold. Alternatively, shell cordovan develops a distinctive patina over time, adding long-term character to the pairing.

To replace the strap on the Datejust 31, a spring bar tool is required to remove the spring bars securing the strap to the lugs. It is advisable to work on a soft surface to protect the case and bezel from scratches. If in doubt, it is best to consult a watchmaker or the Casati Milano atelier for a safe strap change.

Yes, Milano Straps produces aftermarket straps specifically calibrated for the 16mm lug width of the Datejust 31. Models available in the dedicated online collection respect the original Rolex geometry and are offered in alligator, calf leather, shell cordovan and rubber. For a fully bespoke result, the Casati Milano atelier is available by appointment.

The longevity of a leather strap depends on the material, frequency of use and maintenance. A quality vegetable-tanned alligator strap, worn regularly and kept away from water and perspiration, can last between two and five years while retaining its structural integrity and patina. Using a deployant clasp reduces daily mechanical stress, significantly extending the strap's service life.