Rolex
Datejust 31 278384rbr-0036— lug 16mm

The Rolex Datejust 31 reference 278384rbr-0036 features 16mm lug width. This measurement is specific to the 31mm mid-size Oyster case and should be verified using a digital calliper, measuring the internal distance between the two lugs with the case resting flat and the calliper held perpendicular to the case.

For a white gold case with a diamond-set bezel, a cross-cut glossy alligator strap is the most coherent choice: the scale texture creates an elegant contrast with the bezel's brilliance without competing with the dial. Shell cordovan, with its dense and smooth surface, is an equally refined alternative. A white metal deployant clasp is recommended to preserve the geometry of the lugs over time.

The Datejust 31 uses standard spring bar lugs. To replace the strap, use a dedicated spring bar tool, inserting it into the lug slot to compress and remove the bar. Always work on a soft surface to protect the caseback and the polished surfaces of the case. Alternatively, Casati Milano offers a fitting service at its Milan atelier.

Yes. The Datejust 31 with its 16mm lug width is compatible with any quality aftermarket strap produced in this size with standard spring bars. Milano Straps offers a curated selection of 16mm straps in alligator, calf leather, shell cordovan and technical materials, all handcrafted and fully compatible with this reference without any modification to the case.

Lifespan depends on the material and usage. A quality alligator strap, with regular wear and proper care, typically lasts 2 to 4 years. Shell cordovan, due to its dense and compact structure, tends to last longer and develops a desirable patina over time. Vegetable-tanned calf leather is more sensitive to perspiration and moisture, which accelerates wear; avoid prolonged exposure to water and apply a protective balm every 3 to 4 months.