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

The Rolex Datejust 31 ref. 178273-0015 has a lug width of 16mm. This measurement is taken internally between the two lugs using a digital calliper, with the case closed. It is also important to check the lug geometry: on this model, the strap ends are slightly curved (curved end), which requires appropriately shaped straps to ensure aesthetic continuity with the case.

For the yellow gold Rolesor combination of the Datejust 31 178273-0015, the most suitable materials are polished alligator with a bombé grain — which visually complements the yellow gold — and vegetable-tanned box-calf leather for a more understated look. Brandy or cognac tones enhance the warm hues of the case, while navy blue alligator offers a refined contrast. A deployant clasp in yellow gold or steel completes the pairing with metallurgical coherence.

Changing the strap on the Datejust 31 requires a spring bar tool with a fine tip. Insert the tool into the lateral slot of the lug, compress the spring bar, and slide the strap outward. The operation must be carried out carefully to avoid scratching the Oystersteel case or the yellow gold surfaces. If you are not familiar with this procedure, it is advisable to entrust the work to a watchmaker or the Casati Milano atelier.

Yes. Aftermarket straps for the Datejust 31 178273-0015 must have an attachment width of 16mm and, ideally, curved ends to match the lug geometry. Milanostraps.it offers a selection of 16mm straps in artisanal leather, rubber, and other materials, specifically made for this case size. Casati Milano produces bespoke straps with direct leather selection in the atelier.

The lifespan of a leather strap depends on the material, the tanning method, and daily use. A quality box-calf or alligator strap made with vegetable tanning can last between 2 and 5 years with regular wear, developing an authentic patina over time. Prolonged exposure to water, perspiration, and creams is the main cause of deterioration. The 18-month warranty against manufacturing defects offered by Casati Milano covers the constructive quality of the strap.