Rolex
Datejust 31 278274-0002— lug 16mm

The Rolex Datejust 31 reference 278274-0002 features a lug width of 16 millimetres. This measurement is crucial for determining compatibility with any third-party strap. To verify, position a ruler perpendicular to the case, measuring from the bottom of one lug to the bottom of the opposite lug. On all models of this reference, the width remains consistent and certified.

For a Datejust 31 in stainless steel and white gold, alligator represents the most coherent aesthetic choice, offering regular grain and sober patina. Vegetable-tanned calf leather serves as a versatile alternative, with natural ageing that enhances the case over time. Shell cordovan imparts tactile luxury and superior durability. For more technical contexts, a thick cotton NATO or structured rubber maintains aesthetic credibility without compromise.

Replacement requires a spring bar tool and a pair of tweezers. Position the watch with the lug facing upward, insert the tool into the hole beneath the lug, apply gentle pressure to release the spring pin, and extract the old strap. Insert the new strap by seating the spring mechanism through the two dedicated holes. Professional assistance is recommended if inexperienced, to avoid scratching the two-tone case.

Any strap with a 16-millimetre lug width is mechanically compatible. However, to optimise aesthetics, moderate-thickness straps (approximately 3.5–4.5 millimetres) that respect the subtle case curvature are preferred. Artisanal models with tapered shoulders ensure perfect fit without rigidity.

A quality leather strap (alligator, calf, shell cordovan) with moderate daily wear typically lasts 3–5 years before requiring replacement. Longevity depends on wear intensity, ambient humidity, and maintenance (regular drying, avoiding perspiration build-up). A well-made strap, particularly vegetable-tanned leather, may require only reconditioning rather than complete replacement if managed with competent care.