Strap for Datejust 31 Rolesor Yellow Domed / Oyster / Champagne Computer

The Rolex Datejust 31 ref. 178243-0027 has a lug width of 16mm. This measurement is specific to the 31mm variant and is not shared with the Datejust 36mm (20mm) or the Lady-Datejust 28mm (13mm). To verify aftermarket strap compatibility, measure the internal distance between the lugs with a calliper: the correct value is exactly 16mm.

For the Yellow Rolesor variant, alligator belly or hornback straps in bordeaux, cognac or tobacco tones complement the 18-carat yellow gold details. Vegetable-tanned calf leather is ideal for those who appreciate an evolving patina, whilst shell cordovan offers exceptional durability and a characteristic compact lustre. A gold-plated deployant clasp maintains metallic consistency with the case. All straps must feature 16mm lug ends.

Changing the strap on the Datejust 31 requires a springbar tool to remove the spring bars from the 16mm lugs. It is essential to rest the case on a soft cushion during the operation to avoid scratching the bezel or caseback. For premium leather straps — where the precision of the lug-to-leather fit is critical to the final aesthetic — it is advisable to entrust the fitting to a specialist watchmaker or atelier such as Casati Milano.

Yes. The Datejust 31 ref. 178243-0027 accepts any aftermarket strap with a 16mm lug width and a curvature radius compatible with the Oyster case. milanostraps.it offers a curated selection of 16mm straps in alligator, calf leather, shell cordovan and rubber, crafted to fit the Datejust 31 lugs precisely. The Oyster case, water-resistant to 100 metres, is also fully compatible with rubber or synthetic waterproof straps.

The lifespan of a leather strap depends on the quality of the hide, frequency of wear and maintenance. A high-grade alligator or shell cordovan strap, regularly conditioned with leather cream and kept away from moisture, can last between 3 and 7 years with daily use. Vegetable-tanned calf develops a fine patina over time but is more susceptible to water exposure. For sporting or summer use, a rubber strap is preferable. Casati Milano provides an 18-month warranty against manufacturing defects on all bespoke straps.