Strap for BC4 Small Second Pointer Day Stainless Steel / Black / Bracelet

The lug width is 22mm. Oris selected this width to achieve balanced visual proportions on the 42.70mm case and to ensure compatibility with medium-to-robust wrist sizes. To measure correctly, use digital callipers or a ruler on the interior distance between the two lugs at the base of the case, not at the extremity where the taper narrows.

It depends on intended usage. For sartorial elegance: alligator in vegetable tanning or grain calf leather. For daily versatility: NATO in regenerated textile or cotton—practical, durable, and imparts an immediate avionic character to the BC4. For aquatic or desert environments: FKM Tropic rubber with superior grip. The understated brushed steel case accepts all these options without visual compromise.

The BC4 uses standard lugs. Obtain a dedicated spring bar tool or visit a specialist workshop. Locate the small metal springs (spring bars) at the strap ends, gently compress with the tool to release the old strap, insert the new one and allow the spring bar to snap into the lug seats. Takes 2–3 minutes for experienced users, but if uncertain, prefer professional service to avoid case scratching.

Yes, numerous options. The 22mm width is standard in the sport-elegant segment, so the aftermarket offers broad selection: artisanal Italian leather manufacturers, European NATO producers, commercial-grade military rubbers. The BC4 accepts any 22mm strap readily—compatibility is assured by lug geometry. The true variable is construction quality: prefer manufacturers using natural yarns, vegetable glues, and double-stitch seams for generational durability.

Longevity depends on usage and tanning method. Vegetable-tanned leather with daily wear: 3–5 years. Quality vegetable leather is biologically stable, develops noble patina over time and from perspiration. Shell cordovan (if available): 6–8 years if not under excessive stress. Textile NATO: 10+ years of near-indestructibility. Tropic rubber: 5–7 years before cellular hardening. Longevity increases if you store the strap away from direct heat sources and clean it monthly with a soft, damp cloth.