Rolex
Datejust 31 178279-0033— lug 16mm

The Rolex Datejust 31 ref. 178279-0033 has a lug width of 16mm. This measurement refers to the internal distance between the two lugs, taken at the base with a digital calliper. Any aftermarket strap must conform to this attachment width for a correct and secure fit.

For an 18-carat white gold case such as the one on the 178279-0033, the most appropriate materials are belly-cut alligator leather — in black, grey or bordeaux — and vegetable-tanned box calf. Shell cordovan is preferred by those seeking longevity and a natural patina over time. An ardillon buckle or a flat deployant clasp in white gold coordinates the ensemble without visual interruption.

Removing the original bracelet or strap requires a dedicated springbar tool, a fine-tipped instrument that compresses the springbars housed within the lugs. Care must be taken to avoid scratching the white gold lugs: use of a protective watch cushion is strongly recommended. If you are unfamiliar with the procedure, consult a watchmaker or specialist atelier.

Yes, several artisan manufacturers produce straps with a 16mm attachment width compatible with the Datejust 31. Milano Straps offers a curated selection of leather, rubber and textile straps in 16mm, available in various tapers and closure types. For a bespoke result, Casati Milano provides made-to-measure straps with direct leather selection at the Milan atelier.

The lifespan of a leather strap depends on hide quality, daily care and frequency of use. A high-quality alligator or shell cordovan strap, kept away from water and occasionally treated with a specific leather conditioner, can last between three and six years whilst retaining its structural and aesthetic integrity. Casati Milano straps carry an 18-month warranty against manufacturing defects.