Rolex
Datejust 31 178159-0056— lug 16mm

The Rolex Datejust 31 ref. 178159-0056 features a lug width of 16mm. This measurement is specific to the 31mm case size and differs from the 20mm lug width of the Datejust 36 or 41. To verify it, simply measure the internal distance between the case lugs at the strap attachment point using a digital calliper.

For a white gold case such as that of the Datejust 31 178159-0056, the most appropriate materials are dark-toned alligator leather (midnight blue, dark brown, burgundy) and box-calf leather in vegetable tanning. Both respect the material register of white gold without competing with the diamond-set dial. A deployant clasp in white gold or polished steel provides the ideal finishing touch.

To replace the strap on a Datejust 31, use a fine-tipped springbar tool inserted into the inner lug slot to compress the spring bars. It is advisable to work on a soft surface to avoid scratching the white gold case. If in doubt, Casati Milano offers a strap-fitting service in the atelier by appointment.

Yes, high-quality aftermarket straps are available for the 16mm lug width of the Datejust 31. Milano Straps offers a dedicated selection in alligator leather, calf leather and shell cordovan, crafted with standard 1.5mm spring bars compatible with Oyster case lugs. All models are available at milanostraps.it in the 16mm strap section.

The lifespan of a leather strap depends on the material, frequency of use and care. A quality alligator strap, with regular use and protection from water, can last between 2 and 5 years while retaining a dignified patina. Vegetable-tanned calf leather develops a characteristic patina over time but is more susceptible to moisture. Shell cordovan, due to its dense fibre structure, is among the most wear-resistant materials available. Milano Straps offers an 18-month guarantee against manufacturing defects.