Rolex
Datejust 31 278383rbr-0020— lug 16mm

The Rolex Datejust 31 ref. 278383rbr-0020 has a lug width of 16mm. This is a non-standard size compared to larger Datejust references. It is essential to verify this measurement with a calliper before purchasing an aftermarket strap, by measuring the internal distance between the two lower lugs of the case.

For this yellow gold and stainless steel reference with a diamond-set bezel, the most appropriate straps are in Mississippiensis alligator (hornback or square scale grain) or vegetable-tanned calf leather. Both materials complement the reflection of the diamonds without overpowering the dial. Shell cordovan is an alternative for those seeking a dense, progressively character-developing surface.

Strap replacement requires a fine-tipped springbar tool to remove the spring bars from the lugs. On a 16mm Datejust 31, it is advisable to use precision instruments to avoid scratching the yellow gold and stainless steel case. If in doubt, Casati Milano offers a professional fitting service at the atelier by appointment.

Yes. Aftermarket straps with a 16mm lug width are compatible with this reference, provided that the end-piece curvature matches the profile of the Oyster case. Milano Straps offers a selection of handcrafted 16mm straps in various materials and colours, manufactured to the precise dimensions required for this case diameter.

Longevity depends on the material and daily use. A quality alligator strap with vegetable tanning can last between 2 and 5 years with proper care — avoiding prolonged exposure to moisture and perspiration. Shell cordovan tends to last longer due to the compactness of its fibres. All Milano Straps straps carry an 18-month warranty against manufacturing defects.