Strap for Datejust 31 Stainless Steel - Rose Gold / Diamond/ Silver - Floral / Oyster

The lug width of the Rolex Datejust 31 ref. 278381RBR-0031 is 16mm. This non-standard measurement — compared to the more common 18-20mm range — is specific to the 31mm Oyster case and determines aftermarket strap compatibility. To verify it on your own piece, measure the internal distance between the lugs using a calliper, not the external case width.

For the Datejust 31 278381RBR-0031, with its Oystersteel-Everose combination and gem-set bezel, the most suitable materials are vegetable-tanned alligator (for elegance and developing patina), smooth ciré calfskin (for refined daily wear) and shell cordovan (for durability and character). The correct attachment width is 16mm. A steel deployant clasp completes the pairing by reducing mechanical stress on the lugs.

To replace the strap on the Datejust 31, the spring bars connecting the strap to the case lugs must be removed. A spring bar tool is inserted into the small notch on the side of each lug to compress the spring-loaded pins. The operation requires care to avoid scratching the case middle. It is advisable to work on a soft surface and, if in doubt, to consult a watchmaker or the Casati Milano atelier.

Yes, aftermarket straps compatible with the Datejust 31 278381RBR-0031 exist, provided the attachment width is exactly 16mm. Given the non-standard measurement, the available selection is narrower than for 18-20mm sizes. Milano Straps offers handcrafted 16mm straps, available both as bespoke commissions and as ready-to-ship pieces, with materials and finishes consistent with the calibre of the timepiece.

The lifespan of a leather strap depends on the quality of the tanning process, daily use and maintenance. A high-quality vegetable-tanned alligator strap, with regular wear, typically lasts 2 to 4 years before replacement is required. Shell cordovan tends to last longer due to the density of its fibres. Prolonged exposure to water, perspiration and perfumes accelerates deterioration: rotating straps and avoiding contact with aggressive liquids is strongly recommended.