Rolex
Datejust 31 178159-0069— lug 16mm

The Rolex Datejust 31 ref. 178159-0069 features a lug width of 16mm. This measurement is taken between the lugs at the point where the strap attaches to the case and must be matched precisely to ensure correct fitment and a clean, secure installation.

For an 18-carat white gold case measuring 31mm, the most suitable materials are alligator belly leather in black or midnight blue for a formal contrast, shell cordovan in burgundy for a refined patina, or vegetable-tanned calf leather for versatile daily wear. A deployant clasp in steel or white gold completes the pairing with stylistic coherence.

Strap replacement requires a thin flat-head screwdriver or a dedicated spring bar tool to release the spring bars from the lugs. To avoid scratching the white gold case, it is advisable to consult a qualified watchmaker or experienced technician. Once the spring bars are removed, the new 16mm strap clicks into place in seconds.

Yes, several artisan manufacturers produce aftermarket straps compatible with the 16mm lug width of the Datejust 31. Milano Straps and the Casati Milano atelier craft bespoke straps in premium leathers, with full customisation options for colour, texture and closure, backed by an 18-month warranty against manufacturing defects.

Longevity depends on the leather type and frequency of wear. A quality alligator strap, properly maintained, retains its structural integrity for 3–5 years. Shell cordovan, owing to its dense fibre structure, can last even longer. Vegetable-tanned calf leather develops a desirable patina but typically requires replacement every 2–3 years under daily use. Avoiding prolonged exposure to water and perspiration significantly extends strap life.