Rolex
Datejust 31 278278-0039— lug 16mm

The Rolex Datejust 31 ref. 278278-0039 has a lug width of 16 mm. This measurement, taken with a digital calliper between the two lugs of the case, is essential when selecting a compatible aftermarket strap. Straps with straight ends and a 16 mm width fit correctly into the Oyster yellow gold case geometry.

For an 18-carat yellow gold case, lacquered black or bordeaux alligator straps provide the most refined chromatic contrast. Vegetable-tanned cognac leather or burgundy shell cordovan are premium alternatives that develop a distinctive patina over time. For sporting contexts, black vulcanised rubber offers water resistance with understated aesthetics. A yellow gold buckle or deployant clasp completes the metallic consistency of the piece.

To replace the strap on the Datejust 31, a spring bar tool is required to compress the 16 mm spring bars laterally, releasing the strap from the lugs. The operation can be carried out by a watchmaker or, with the correct tools, by the owner. It is advisable to work on a soft surface to protect the yellow gold case from scratches.

Yes. A number of artisan manufacturers produce aftermarket straps in 16 mm lug width compatible with the Datejust 31. Milano Straps offers a selection of leather, rubber and technical-material straps in 16 mm, available online or made to measure at the Casati Milano atelier. It is important to verify that the chosen strap has straight ends to fit the Oyster case correctly.

The lifespan of a leather strap depends on the material, care and daily use. A high-quality alligator strap, with regular use and appropriate maintenance (periodic conditioning, kept away from water), can last between three and seven years. Shell cordovan, thanks to its dense and resilient structure, tends to offer superior longevity. The Casati Milano guarantee covers manufacturing defects for 18 months.