Rolex
Datejust 31 278383rbr-0002— lug 16mm

The Rolex Datejust 31 ref. 278383rbr-0002 features a lug width of 16mm. This measurement should be taken at the narrowest point between the two lugs, closest to the crystal, using a digital calliper for accuracy. Any aftermarket strap intended for this model must have a 16mm attachment width.

For the Datejust 31 in yellow Rolesor, the most suitable materials are alligator leather in tobacco, cognac or bordeaux tones — which complement the warmth of 18-carat yellow gold — and vegetable-tanned calf leather with a box finish for formal settings. Shell cordovan is a refined choice for those seeking a tight-grained texture with a characteristic shimmer. A deployant clasp in steel or yellow gold completes the pairing, adding comfort and visual symmetry.

To replace the strap on a Rolex Datejust 31, you will need a fine-tipped springbar tool. Insert the tool into the lug hole or between the strap end and the case, compress the springbar pin and slide the strap out with a controlled lateral movement. Work on a soft surface to avoid scratching the yellow Rolesor case. For a risk-free operation, it is advisable to consult a watchmaker or the Casati Milano atelier.

Yes, high-quality aftermarket straps compatible with the Datejust 31 are available for the 16mm lug width. It is essential that the strap has a 16mm attachment width and an end thickness calibrated to fit the slightly curved lug geometry specific to Rolex cases. Milanostraps.it offers a curated selection of handcrafted leather, NATO and rubber straps specifically sized for the 16mm lug, with bespoke customisation available through the Casati Milano atelier.

The lifespan of a leather strap depends on the material and conditions of use. A quality alligator strap, properly maintained and alternated with other straps, can last between 3 and 5 years whilst retaining its structure. Vegetable-tanned calf leather develops a distinctive patina over time, with an average lifespan of 2 to 4 years under daily use. Shell cordovan, owing to its densely compacted grain, is among the most resistant materials to wear and deformation. Prolonged exposure to water, perspiration and perfume significantly accelerates the degradation of any leather.