Rolex
Datejust 31 278341rbr-0002— lug 16mm

The Rolex Datejust 31 278341rbr-0002 features a 16mm lug width. This is a non-standard measurement within the Rolex range — narrower than the 20mm found on the Submariner — and requires straps specifically manufactured for this attachment width. Always verify with a calliper before purchasing an aftermarket strap.

For the Datejust 31 278341rbr-0002 in Everose gold and Oystersteel, a vegetable-tanned alligator strap in cognac or midnight blue represents the most coherent choice aesthetically. The natural grain of alligator leather complements the texture of the integrated lugs, while vegetable tanning ensures the development of a genuine patina over time. As a versatile daily-wear alternative, box-grain calf leather is equally refined at a lower price point. Curved ends are recommended for a seamless fit against the case.

To replace the strap on a Datejust 31, a fine-tipped spring bar tool is required. Insert the tip into the gap between the lug and the strap, compress the spring bar inward and slide the strap outward. The operation demands care to avoid scratching the Everose gold lugs. If you are not experienced with this procedure, it is advisable to consult a watchmaker or specialist. Note that Rolex spring bars have a specific diameter; aftermarket replacements must match exactly.

Yes, aftermarket straps compatible with the 16mm lug width of the Datejust 31 are available. Production in this size is less widespread than standard formats, but specialist craftsmen such as Casati Milano manufacture bespoke straps with curved ends to fit the case precisely. It is essential to specify both the attachment width (16mm) and the required curvature. Straps listed online at milanostraps.it in the 16mm category are selected for compatibility with this case size.

The lifespan of a leather strap depends on the material, maintenance and frequency of use. A quality vegetable-tanned alligator strap, kept away from water and perspiration and treated periodically with a conditioning cream, typically lasts 3–5 years with daily wear. Calf leather has a shorter lifespan (2–3 years) but is less costly to replace. Shell cordovan, owing to its dense and compact structure, can exceed 5 years whilst retaining its shape. Storing straps in a dry environment and rotating between multiple pieces significantly extends the life of each strap.