Rolex
Datejust 31 278278-0021— lug 16mm

The Rolex Datejust 31 ref. 278278-0021 features a lug width of 16mm. This non-standard measurement — compared to the more common 18mm or 20mm — requires careful selection of any replacement strap. It is advisable to verify the lug width with a digital calliper before purchasing a strap.

For the yellow gold case of the Datejust 31, alligator leather with a gloss finish and shell cordovan are the most suitable choices for formal settings, as their texture and natural patina complement the precious metal. For everyday wear, vegetable-tanned calf leather offers both comfort and refinement. The recommended closure is a yellow gold pin buckle or a butterfly deployant clasp at 16mm.

To replace the strap on the Datejust 31, a suitable spring bar tool or thin-tipped lever is required. The spring bars connecting the strap to the case lugs must be carefully removed to avoid scratching the gold surface. It is recommended to work on a soft watchmaker's mat and, if in doubt, to entrust the operation to a professional watchmaker or the Casati Milano atelier.

Yes. Milano Straps manufactures handcrafted straps compatible with the 16mm lug width of the Datejust 31. Available models include alligator, shell cordovan, vegetable-tanned calf leather and rubber, with bespoke stitching and finishing. Each strap is produced to match the original Rolex lug geometry for a precise and secure fit.

The lifespan of a leather strap depends on the material, frequency of use and wearing conditions. A high-quality alligator or shell cordovan strap, kept away from excessive moisture and perspiration, can last between 3 and 7 years while developing a distinguished patina. Milano Straps products are covered by an 18-month guarantee against manufacturing defects.