Rolex
Datejust 31 278384rbr-0020— lug 16mm

The lug width of the Rolex Datejust 31 reference 278384rbr-0020 is 16mm. This measurement is taken internally between the two lugs using a millimetre calliper. Using a strap with the exact 16mm width is essential to ensure a precise fit and a clean aesthetic result.

For the Datejust 31 in white gold with a diamond-set bezel, an authentic alligator strap with vegetable tanning is the most coherent choice, complementing the jewellery-oriented character of the watch. Alternatively, shell cordovan develops a distinctive patina over time and suits daily wear particularly well. Both options are available bespoke through the Casati Milano atelier or in the 16mm strap collection on milanostraps.it.

To replace the strap on the Rolex Datejust 31, the 16mm spring bars securing the strap to the lugs must be removed. This requires a forked springbar tool. The operation should be carried out on a soft surface to avoid scratching the case, and the spring bars should be confirmed fully seated before wearing the watch. If in doubt, it is advisable to entrust the operation to a watchmaker or the atelier.

Yes, a wide range of aftermarket straps is compatible with the Rolex Datejust 31, provided they conform to the 16mm lug width and feature a curved end suited to the Oyster lug profile. Milano Straps offers a selection of handcrafted leather, cordovan and other material straps, available bespoke or ready to ship, with buckle or deployant clasp options in white gold for full aesthetic consistency.

The lifespan of a leather strap depends on the material, frequency of use and care. A genuine alligator strap with vegetable tanning, worn regularly but not daily and stored away from moisture and perspiration, can last between 3 and 6 years in excellent condition. Shell cordovan, owing to the density of its subcutaneous fibres, tends to develop a patina over time rather than deteriorating. Casati Milano provides an 18-month warranty against manufacturing defects on all its straps.