Strap for Datejust 31 Stainless Steel Diamond / Jubilee / Black - Roman

The Rolex Datejust 31 reference 178384-0039 is equipped with a 16-millimetre lug width. This measurement is taken between the centres of the two horizontal pins connecting the strap to the case. It is essential to use a strap with this precise lug width specification to ensure proportionate aesthetics and correct fit on the wrist.

For the 178384-0039, the best strap depends on intended use and context. Alligator leather with vegetable tanning remains the traditional choice, developing patina over time. Calf leather offers daily versatility and uniform texture. Shell cordovan guarantees structural rigidity and unmatched natural patina. Colour selection — cognac, black, burgundy, grey — must consider the formal language of the two-tone Rolesor design.

Changing the strap on a Datejust 31 requires removal of the two lateral pins that secure the strap to the lugs. Use a specialised tool (spring bar tool) to compress the horizontal pin and extract it from its seat. Verify that the new strap has exactly 16mm lug width. To prevent scratching the case, it is advisable to entrust the operation to experienced professionals such as the master craftsmen at Casati Milano.

Yes, provided the aftermarket strap has a certified 16mm lug width. It is essential to verify compatibility through direct measurement with a digital calliper. We advise against low-quality straps: strap craftsmanship must reflect the excellence of the Rolex case. Artisanal straps from Casati Milano, crafted with certified alligator, shell cordovan and premium calf leather, guarantee durability and aesthetic coherence with the watch's value.

The lifespan of a quality leather strap depends on use, environment and maintenance. Premium-grade alligator or vegetable-tanned calf typically lasts 3-5 years of daily wear, developing natural patina that enhances aesthetics and narrative value. Shell cordovan, due to its dense fibrous structure, can last 5-7 years or more with proper care. Seasonal rotation between straps (changing every 2-3 months) significantly extends the longevity of each piece.