Rolex
Datejust 31 278344RBR-0006— lug 16mm

The lug width of the Rolex Datejust 31 reference 278344RBR-0006 is 16 mm. This is a non-standard size compared to more common calibres such as 18 mm or 20 mm, so straps must be specifically manufactured to this width to ensure a correct, play-free fit.

For the Datejust 31 with a mother-of-pearl dial and diamond-set bezel, a vegetable-tanned alligator strap with a polished finish is the most coherent choice: the regular belly grain engages visually with the baguette geometry of the bezel. Shell cordovan is an equally refined alternative, developing a rich natural patina over time. Ivory, pearl grey or midnight blue tones produce chromatically impeccable pairings.

To remove the original strap from the Datejust 31, a flat-tipped springbar tool must be inserted into the lug hole to compress the springbars. Care is required to avoid scratching the white gold lug surfaces. It is advisable to entrust this operation to a watchmaker or specialised atelier, particularly on models with white gold integrated lugs.

Yes, aftermarket straps are available specifically made for the 16 mm lug width of the Datejust 31. milanostraps.it offers a selection of compatible straps in various materials — alligator, calf leather, shell cordovan — crafted to an exact 16 mm lug width. Always verify the lug width stated by the manufacturer before purchasing.

The lifespan of a leather strap depends on the material, the tanning quality and conditions of use. A high-quality vegetable-tanned alligator strap, properly maintained and used in rotation, can last between 3 and 7 years while retaining its structural and aesthetic integrity. Shell cordovan, owing to its dense fibre structure, tends to last longer and develops a distinctive patina. Prolonged exposure to water and perspiration accelerates deterioration.