Strap for Datejust 31 Rolesor Fluted Diamond / Jubilee / Silver Roman

The Rolex Datejust 31 ref. 178313-0074 has a lug width of 16mm. This measurement is taken with a digital calliper inside the lug channel at its narrowest point, with the case resting flat on a stable surface. As 16mm is not the most common width in mass-market production, it is advisable to use straps specifically engineered for this lug spacing to ensure a precise fit.

For the Datejust 31 in yellow Rolesor, the materials that best complement the steel-yellow gold combination are alligator in warm tones (cognac, tobacco, bordeaux) and vegetable-tanned calfskin that develops a personal patina over time. Shell cordovan is ideal for those seeking a mirror-like surface with warm reflections. For sporting or summer use, a vulcanised rubber strap preserves the Oyster water resistance. A deployant clasp completes the pairing whilst protecting the strap from deformation at the fold.

To replace the strap on the Datejust 31, remove the 16mm spring bars using a dedicated double-pronged spring bar tool or a fine-blade screwdriver. The Datejust lugs are curved, so the new strap ends must be pre-curved or sufficiently pliable to follow the case profile without lifting at the sides. Work on a soft surface to prevent scratches to the yellow gold and 904L stainless steel case.

Yes, the aftermarket offers compatible straps for 16mm lug width suited to the Datejust 31. Casati Milano produces bespoke straps specifically shaped for the curved lugs of this model, available in alligator, vegetable-tanned calfskin, shell cordovan and vulcanised rubber. Unlike generic 16mm straps, the ends are formed to the actual case geometry, ensuring a precise fit and a refined appearance.

The lifespan of a leather strap depends on leather quality, wearer care and frequency of use. A high-grade vegetable-tanned calfskin or alligator strap, with daily wear and basic maintenance (avoiding prolonged perspiration, moisture and direct perfume contact), will retain structural and aesthetic integrity for 3 to 5 years. Shell cordovan tends to last longer owing to its denser fibre structure. Casati Milano offers an 18-month guarantee against manufacturing defects on all straps made in the atelier.