Strap for BC4 Small Second Pointer Day Stainless Steel / Black

The BC4 features a 22mm lug width. This dimension is standard for medium-to-large watches and is easily verified by measuring the distance between the spring bar pins with a caliper. The 22mm size ensures broad compatibility with aftermarket straps without structural compromise.

For the BC4, we recommend a vegetable-tanned leather strap to preserve its aeronautical character. An alligator strap adds formality, whilst vegetable-tanned calf offers durability and natural patina development. For tactical contexts, a Cordura NATO maintains functionality; for humid environments, vulcanised rubber is ideal.

Gently remove the original strap by pushing inward the spring bar pins connecting the strap to the case. Once extracted, disconnect the strap and align the new one's holes with the case lugs, then press the pins until they seat naturally. Avoid sharp tools that might scratch the case.

Yes, any strap with a 22mm lug width is compatible with the BC4. Ensure the strap thickness is proportional to the 42.70mm case: typically, a thickness between 3.5mm and 5mm guarantees balanced aesthetics. Always verify dimensions before purchase.

A quality vegetable-tanned leather strap lasts 3-5 years with regular wear, depending on exposure to moisture, perspiration, and UV rays. With periodic cleaning and protection from saline or excessively humid environments, lifespan can be extended. The patina that develops is normal and enriches the strap's character.