Rolex
Datejust 31 178279-0078— lug 16mm

The Rolex Datejust 31 ref. 178279-0078 features a lug width of 16mm. This measurement is specific to the 31mm case size and differs from the 20mm lug width found on the Datejust 36mm and 41mm references. Before purchasing an aftermarket strap, it is advisable to verify the lug width using a calliper to account for any variation resulting from servicing or wear.

For an 18-carat white gold case, the most suitable materials are belly alligator with natural grain, box calf leather with vegetable tanning, and shell cordovan. Alligator maintains formal consistency with the watch's elegant character; box calf develops a personal patina over time; shell cordovan provides structural rigidity and precise lug retention. A deployant clasp in steel or white gold PVD is recommended to complete a formal pairing.

To replace the strap on a Datejust 31, the spring bars securing the strap to the case lugs must be removed using a dedicated springbar tool or fork-tipped screwdriver. Given the narrow 16mm lug width and the value of the white gold case, it is strongly advised to entrust this operation to a qualified watchmaker or to use the installation service available at Casati Milano to avoid scratching the case.

Yes, high-quality aftermarket straps compatible with the Datejust 31 at 16mm lug width are available. Milano Straps produces hand-stitched leather and alligator straps cut precisely to this measurement, including a matching keeper. When placing an order, it is important to specify the 16mm lug width and the desired taper width at the buckle end, typically 14mm.

The lifespan of a leather strap depends on material quality, care and frequency of use. A vegetable-tanned calf strap, properly maintained and rotated with other straps, can last between two and five years. Top-grade alligator, owing to the natural structure of its scales, tends to be more durable. Milano Straps offers an 18-month guarantee against manufacturing defects on all handcrafted straps.