Strap for Datejust 31 Yellow Gold / Domed / MOP / President

The Rolex Datejust 31 Ref. 278248-0016 has a lug width of 16mm. This measurement should be taken using digital callipers positioned between the inner walls of the lugs, measuring the clear gap at the point where the strap attaches. Using straps manufactured precisely at 16mm is essential to avoid play or pressure on the gold case.

For an 18-carat yellow gold case, the most suitable materials are hornback alligator in cognac or tobacco, shell cordovan in bordeaux, and naturally tanned calf leather. These materials complement the warm tones of yellow gold chromatically and develop a patina over time that further enhances the watch. A yellow gold buckle or deployant clasp is recommended to maintain metallic consistency.

Strap replacement requires a fine-tipped spring bar tool. Insert the tip into the lug slot, compress the spring bar pin, and slide the strap outward. On gold cases, it is advisable to protect the surfaces with PTFE tape or a soft cloth during the operation. Casati Milano atelier also carries out strap changes by appointment.

Yes. Aftermarket straps with a 16mm lug width are fully compatible with the Datejust 31 Ref. 278248-0016. Milano Straps produces handcrafted straps trimmed precisely to 16mm, with straight or pre-curved ends to accommodate the domed profile of the gold lugs. The buckle is also available in a gilt finish to maintain aesthetic consistency with the original case.

The lifespan of a leather strap depends on the material, care and daily use. A quality alligator strap, conditioned with leather cream every 3–4 months and kept away from prolonged contact with water and perspiration, can last between 3 and 7 years while retaining its appearance and structural integrity. Shell cordovan, owing to the density of its fibres, tends to last longer and develops a characteristic patina. Milano Straps offers an 18-month guarantee against manufacturing defects.