Rolex
Datejust 31 178344-0059— lug 16mm

The Rolex Datejust 31 178344-0059 features a lug width of 16mm. This is a non-standard size compared to more common Rolex formats. When purchasing a compatible strap, always verify this measurement using a digital calliper placed between the inner edges of the lugs, flush against the case shoulders.

For the Datejust 31 178344-0059 in white Rolesor, alligator straps in vegetable-tanned leather or shell cordovan are the most coherent choices given the watch's formal register. Hornback or belly alligator grain complements the polished finish of the white gold lugs; shell cordovan develops a deep patina over time. Both must feature a 16mm attachment width.

Replacing the strap on a Datejust 31 requires a fine-tipped spring bar tool. The 16mm spring bars must be compressed laterally to release them from the lugs. Given the polished white gold case finish, it is advisable to protect the lugs with technical tape or to entrust the operation to a watchmaker or to the Casati Milano atelier to avoid scratching the surfaces.

Yes. Several artisan manufacturers produce aftermarket straps in 16mm compatible with the Datejust 31. Milano Straps offers a curated selection of 16mm straps in premium leathers — alligator, calfskin, shell cordovan — crafted via bespoke commission at the Casati Milano atelier or available directly online.

The lifespan of a leather strap depends on the quality of the tanning process, daily use, and maintenance. A high-quality vegetable-tanned alligator strap, used with care and kept away from moisture and heavy perspiration, typically lasts between 3 and 5 years. Shell cordovan, owing to its dense fibre structure, often lasts longer, developing a patina rather than deteriorating. The Casati Milano guarantee covers manufacturing defects for 18 months.