Rolex
Datejust 31 278243-0017— lug 16mm

The Rolex Datejust 31 ref. 278243-0017 has a lug width of 16mm. This measurement refers to the internal distance between the lugs where the strap is fitted, and is specific to the 31mm variant of the Datejust family. Any strap replacement must strictly adhere to this dimension to ensure correct fit and visual alignment.

For the Datejust 31 278243-0017 in Oystersteel and yellow gold, alligator straps in warm tones — cognac, honey, tobacco — are the most aesthetically coherent choice, complementing the yellow gold bezel. Shell cordovan develops a distinguished patina over time, while vegetable-tanned calf leather offers everyday versatility. For sport or summer use, vulcanised rubber is the most practical option.

Replacing the strap on a Rolex Datejust 31 requires a springbar tool to compress and remove the spring bars connecting the strap to the lugs. The process requires care to avoid scratching the lugs or the case. It is advisable to have the strap change carried out by a watchmaker or a specialist atelier. Casati Milano offers this service by appointment at their Milanese atelier.

Yes. The Rolex Datejust 31 278243-0017 features standard 16mm lugs, a size for which a wide range of high-quality aftermarket straps is available. Milano Straps offers handcrafted straps in alligator, calf leather, shell cordovan and rubber, all made to 16mm lug width with spring bars included. These are artisan aftermarket alternatives, not original Rolex parts.

The lifespan of a leather strap depends on the quality of the hide, the craftsmanship and daily usage. A premium alligator or shell cordovan strap, properly maintained with regular conditioning and protected from moisture, can last between 3 and 6 years with daily wear. Vegetable-tanned calf leather straps typically last 2 to 4 years. Casati Milano straps carry an 18-month warranty against manufacturing defects.