Strap for Datejust 31 Yellow Gold Domed / Oyster / Black MOP Computer

The Rolex Datejust 31 178248-0026 has a lug width of 16mm. This measurement is specific to the 31mm versions of the Datejust family and differs from the more common aftermarket sizes. To verify it, measure the internal distance between the lower lugs using a digital calliper held perpendicular to the longitudinal axis of the case.

For a yellow gold Datejust 31, a vegetable-tanned alligator strap represents the most coherent pairing both aesthetically and technically: the scale texture complements the fluted bezel and the precious case. Shell cordovan is a distinguished alternative, developing a rich patina over time. For daily wear, box calf leather offers durability without compromising elegance. In all cases, the lug width must be 16mm.

To replace the strap, a fine-tipped springbar tool is required — ideally with a protected tip to avoid scratching the yellow gold lugs. The Jubilee bracelet or aftermarket straps are removed by pressing the spring bars located inside the lugs. It is advisable to work on a soft watchmaker's mat to prevent case damage. If in doubt, entrust the operation to a watchmaker or to the Casati Milano atelier, particularly given the value of a precious metal case.

Yes, there are artisan-quality aftermarket straps specifically made for the 16mm lug width of the Datejust 31. Milanostraps.it offers a selection of 16mm straps in leather (alligator, calf, shell cordovan), rubber and NATO textile, available both bespoke and ready-to-ship. It is essential to confirm that the strap explicitly states compatibility with the 16mm size, as fitting an 18mm strap risks damaging the yellow gold lugs.

The lifespan of a leather strap depends on the material, frequency of use and care. A quality vegetable-tanned alligator strap, worn regularly, typically lasts 2–4 years; shell cordovan, being denser and more compact, can exceed 5 years with proper maintenance. Box calf leather, being more porous, requires periodic conditioning and greater attention to moisture. Storing the watch on a cushion with the strap removed when not in use significantly extends the leather's life.