Rolex
Datejust 31 178384-0019— lug 16mm

The Rolex Datejust 31 ref. 178384-0019 has a lug width of 16 mm. This measurement is standard across the entire Datejust 31 family and determines compatibility with aftermarket straps. To verify it, measure the internal gap between the two lugs at the point where they meet the case, using a digital calliper.

For a white mother-of-pearl dial, the most suitable straps are polished alligator in havana or burgundy — the reptile grain creates an elegant textural contrast — or natural-toned vegetable-tanned calfskin. For a more formal look, midnight blue or burgundy shell cordovan provides character and sheen without excess. All straps must have a 16 mm attachment width.

To remove the original Oyster or Jubilee bracelet from the Datejust 31, a dedicated spring bar tool is required to extract the spring bars from the lugs. Care must be taken not to scratch the Oystersteel case. It is advisable to have the strap change carried out by a watchmaker or a specialist atelier such as Casati Milano, which offers this service by appointment.

Yes. Any strap with a 16 mm attachment width is compatible with the Datejust 31 ref. 178384-0019. Milano Straps offers a selection of handcrafted straps in alligator, calfskin, shell cordovan and NATO, specifically cut to 16 mm, with various length options, standard buckle or deployant clasp, and customisable stitching.

The lifespan of a leather strap depends on the material and care. A quality alligator strap, kept away from water and periodically treated with appropriate products, can last between 3 and 7 years with regular wear. Vegetable-tanned calfskin develops a characteristic patina over time and generally lasts 2 to 4 years. Shell cordovan is the most durable of classic leathers and can exceed 5 years while retaining its shape. Milano Straps offers an 18-month warranty against manufacturing defects.