Rolex
Datejust 31 278344rbr-0001— lug 16mm

The lug width of the Rolex Datejust 31 278344rbr-0001 is 16mm. This measurement is taken internally between the two lugs at the strap attachment point and is the reference dimension required when selecting any aftermarket-compatible strap.

For the 278344rbr-0001 in white gold with a diamond-set bezel, an alligator Mississippi strap with drum-dyed finish is the most aesthetically coherent choice: the natural grain of the scales complements the case texture without overwhelming it. A box calf strap in vegetable-tanned leather is an equally refined alternative, developing a distinctive patina over time. Required lug width: 16mm.

To replace the strap on a Datejust 31, the spring bars must be removed from the lugs using a dedicated spring bar tool. The spring bars typically have a diameter of 1.5mm. It is advisable to work on a soft surface, protecting the bezel and caseback from scratches. If in doubt, Casati Milano offers a strap-fitting service at the atelier, by appointment.

Yes. Any strap with a 16mm lug width and 1.5mm spring bars is technically compatible with the Datejust 31 278344rbr-0001. Milano Straps offers a curated selection of handcrafted straps in alligator, calf leather, rubber and NATO, all manufactured to precise dimensional specifications ensuring correct fit and seating on the original Rolex lugs.

The lifespan of a leather strap depends on the quality of the tannage, frequency of wear and care. A quality alligator or calf leather strap, kept away from water, excessive perspiration and heat sources, will maintain structural integrity and appearance for 2 to 5 years with regular use. Milano Straps provides an 18-month guarantee against manufacturing defects on all its straps.