Rolex
Datejust 31 278384rbr-0024— lug 16mm

The Rolex Datejust 31 ref. 278384rbr-0024 features a lug width of 16 mm. This is a non-standard measurement compared to larger Datejust references. It is essential to fit only straps with a precise 16 mm attachment to avoid mechanical stress on the lugs and keepers.

For the Datejust 31 278384rbr-0024 in white gold Rolesor, a vegetable-tanned alligator strap with a matte or semi-gloss finish is the most coherent choice given the watch's formal character. Cognac and burgundy tones complement the cold reflections of the white gold bezel; midnight blue offers understated elegance without competing with the diamond-set lunette. For everyday or sport wear, smooth calfskin in black or dark brown is equally suitable.

To replace the strap on the Datejust 31, remove the spring bars housed in the 16 mm lugs using a fine-tipped strap-changing tool or a dedicated screwdriver. Care must be taken to avoid scratching the case or lugs. It is advisable to entrust the operation to a watchmaker or a specialist atelier such as Casati Milano to ensure a precise, risk-free replacement.

Yes, aftermarket straps are available provided they feature a 16 mm attachment, the specific lug width of this reference. Milano Straps offers a selection of handcrafted straps in alligator, calfskin, shell cordovan and rubber, fitted with 16 mm spring bars, ensuring mechanical compatibility and an aesthetic finish consistent with the standard of the timepiece.

The lifespan of a leather strap depends on the type of hide, the tanning process and usage conditions. A quality vegetable-tanned alligator strap, with proper care (avoiding prolonged moisture, conditioning every 3–4 months), typically lasts 3–5 years while developing a fine patina. Smooth calfskin offers a similar lifespan; cordovan, thanks to its denser fibre structure, can exceed 5 years. Casati Milano provides an 18-month warranty against manufacturing defects.