Strap for BC4 Flight Timer Stainless Steel / Black / Bracelet

The lug width of the Oris BC4 01 690 7615 4154-Set MB is 22mm, measured as the internal distance between the two lugs on the case. This width is standard for tool watches in this category and allows you to mount quality artisanal straps without structural compromise.

We recommend a vegetable-tanned Tuscan leather strap in vintage brown, which balances the robustness of the case with naturally evolving patina. For more formal wear, an alligator strap in pearl grey enhances the clean geometry of the dial. For humid environments or nautical activities, a butyl rubber strap guarantees maximum water resistance.

Strap replacement is accomplished using the spring bars that connect the strap to the case lugs. Using a dedicated tool (spring bar remover), apply gentle pressure to the bars to slide them into the small lateral grooves. Once released, the old strap slides off; the new one is inserted in reverse sequence, ensuring the bars lock into both lugs. Verify complete bar engagement before wearing the watch.

Yes. The 22mm lug width is an established standard and allows you to fit virtually any artisanal strap designed for this width. Aftermarket straps in Tuscan leather, alligator, shell cordovan, or quality rubber are fully compatible with the Oris BC4 01 690 7615 4154-Set MB's attachment system, allowing you to completely personalise the watch's aesthetics.

A vegetable-tanned leather strap, used with moderate frequency and subjected to regular maintenance (periodic drying, six-monthly conditioning), has an average lifespan of 3–5 years before showing structural failure. Alligator, thanks to denser fibres and greater moisture resistance, reaches 5–7 years. Durability depends on usage context: marine environments or high humidity significantly reduce timeframes; occasional use in temperate climates extends them considerably.