Rolex
Datejust 31 278341rbr-0010— lug 16mm

The Rolex Datejust 31 reference 278341rbr-0010 features a lug width of 16mm. This measurement should be taken with a calliper at the inner distance between the two lugs, at the junction point with the Oyster case. It is a non-standard size compared to the more common 18mm or 20mm widths — always verify this before purchasing any aftermarket strap.

For the Datejust 31 in Everose Rolesor with a diamond-set bezel, a vegetable-tanned alligator strap — in belly or hornback grain — best complements the jewellery-grade identity of the piece. Polished box-calf leather is a more understated alternative that develops a beautiful patina over time. For sport or summer use, vulcanised rubber offers excellent performance and water resistance. In all cases, the attachment head must measure 16mm.

To replace the strap on the Datejust 31, a fine-tipped spring bar tool compatible with Rolex 16mm spring bars is required. Inserting the tip into the lug slot compresses the spring mechanism, releasing the strap. While technically feasible by an experienced hand, given the Rolesor case and diamond-set bezel, it is advisable to entrust the operation to a watchmaker or atelier to avoid scratching the polished surfaces.

Yes. The aftermarket sector offers artisan-quality straps for the 16mm lug width of the Datejust 31. It is essential that the strap features correctly sized attachment bars and that the chosen material — alligator, calf, rubber or nylon — is crafted to a standard befitting the value of the timepiece. Milano Straps offers a curated selection of handcrafted 16mm straps, with bespoke customisation available through Casati Milano.

The lifespan of a leather strap depends on the quality of the hide, the tanning process and daily wear conditions. A first-quality vegetable-tanned alligator strap, with regular use and proper care — kept away from prolonged water exposure and excessive humidity — maintains structural and aesthetic integrity for 3 to 5 years. Calf leather has a slightly shorter lifecycle but develops a characteristic patina appreciated by enthusiasts. Casati Milano offers an 18-month guarantee on manufacturing defects for all bespoke straps.