Rolex
Datejust 31 278384rbr-0001— lug 16mm

The Rolex Datejust 31 ref. 278384rbr-0001 features a lug width of 16 millimetres. This measurement is taken between the inner edges of the lug shoulders—the metal pillars protruding from the case. A 16mm strap sits precisely within the lugs without excessive play, ensuring optimal aesthetic impact and security.

The ideal strap depends on use and personal preference. For formal elegance, we recommend dark brown or polished black alligator with a white gold deployante clasp. For daily versatility, cognac leather with a standard buckle offers balanced refinement. For those who appreciate natural patina development, burgundy shell cordovan represents the pinnacle of understated sophistication. The two-tone gold-steel case requires a strap that harmonises with its chromatic complexity.

Strap replacement requires specialised tools: a very thin flathead screwdriver (1mm) or a spring bar tool. Position the tool beneath the metal spring bar at the lug (the 12 o'clock position), apply gentle downward pressure until the spring clicks free, then withdraw the bar. Repeat at the opposite lug. Insert the new strap by guiding its holes onto the loaded spring bar and push the bar into position until it clicks. If uncertain, consult a professional watchmaker.

Yes, provided the lug width measures exactly 16mm. High-quality aftermarket leather straps—particularly alligator, shell cordovan, and calf—often deliver superior value compared to official Rolex straps and allow greater aesthetic personalisation. Ensure the lug shoulders do not protrude beyond the case edges and that the spring bars are standard diameter (1.8mm).

Longevity varies according to material, wear patterns and maintenance. A quality alligator or shell cordovan strap, worn daily, typically remains serviceable for 3–5 years before significant wear appears at the lugs and flexion points. Calf leather, being softer, may show noticeable ageing within 2–3 years. Expose the strap to natural light regularly (vegetable-tanned leather improves with sun exposure), avoid prolonged moisture and occasionally apply specialist leather conditioner.