Rolex
Datejust 31 278384RBR-0040— lug 16mm

The lug width of the Rolex Datejust 31 ref. 278384RBR-0040 is 16mm. This measurement is taken between the two upper lugs of the case, at the point of contact with the strap, and is the essential parameter for selecting a compatible aftermarket strap.

For a white Rolesor case with a diamond-set bezel, a glossy or semi-glossy alligator strap is the most aesthetically coherent choice, as the rectangular grain complements the fluted texture of the bezel. Shell cordovan or vegetable-tanned calf leather are excellent alternatives, offering versatility and a noble patina that develops gracefully over time.

The strap on a Rolex Datejust 31 is removed using a spring bar tool to extract the spring bars connecting the strap to the case lugs. It is advisable to work on a watchmaker's cushion to avoid scratching the white gold surfaces, and to entrust the operation to a qualified watchmaker or experienced strap craftsman.

Yes, high-quality aftermarket straps are available for the Datejust 31, provided they feature a 16mm attachment width. Milano Straps and the Casati Milano atelier produce bespoke straps in alligator, calf leather and shell cordovan, precisely dimensioned for 16mm lugs and customisable in length and finish to suit individual wrist circumferences.

The lifespan of a leather strap depends on the quality of the hide, daily care and frequency of use. A high-quality alligator or shell cordovan strap, kept away from water and moisture and rotated with other straps, can last between three and six years while developing a distinguished patina. Vegetable-tanned leather straps of the finest quality acquire a characteristic patina over time that enhances their aesthetic value.