Rolex
Datejust 31 178279-0079— lug 16mm

The Rolex Datejust 31 reference 178279-0079 features a lug width of 16mm. This measurement is taken with a digital calliper positioned between the lower lugs of the case, at the strap attachment point. This is a specific dimension requiring straps manufactured to this exact size — it is not compatible with the more common 18mm or 20mm widths.

For the Datejust 31 in white gold, the most aesthetically and qualitatively coherent choices are vegetable-tanned alligator — in belly or hornback grain — and smooth box calf leather. Both complement the elegant character of the model, develop a refined patina over time, and pair well with the white gold case and the principal dial variants of this reference. A deployant clasp in white gold or brushed steel completes the pairing.

The strap on the Datejust 31 is removed using a springbar tool, inserting the tip into the lateral slot of the lug to compress the spring bar. Care must be taken to avoid scratching the white gold case: plastic lug protectors are strongly recommended during the operation. Fitting the new strap follows the reverse procedure, ensuring both spring bars are correctly seated in their housings.

Yes, high-quality aftermarket straps compatible with the Datejust 31 are available, provided they are made to the correct 16mm lug width. Specialist craftsmen such as Casati Milano produce bespoke straps in alligator, calf leather, shell cordovan or rubber with a 16mm attachment, offering a quality level comparable — and in certain cases superior — to original straps, with full customisation of colour, texture, clasp and length.

The lifespan of a leather strap depends on the material, tanning method and daily use. A quality vegetable-tanned alligator strap, with proper care (periodic conditioning, rotation with other watches), can last between 3 and 7 years while maintaining structural and aesthetic integrity. Smooth calf leather generally has a shorter lifespan of 2 to 4 years, whilst shell cordovan is renowned for its exceptional longevity. Prolonged exposure to water and perspiration significantly reduces the strap's useful life.