Strap for BC4 Blue Eagles

The Oris BC4 01 653 7631 4684-Set features a lug width of 22mm. This measurement refers to the distance between the inner spring bars that connect the case to the straps, and ensures a balanced proportion relative to the 45mm case diameter. All 22mm straps are fully compatible with this model.

The choice depends on intended use. For formal or business settings, we recommend alligator or Italian calf leather with vegetable tanning: the compact grain emphasises Swiss sophistication. For sports or marine use, a textile NATO strap in recycled cotton offers durability and practicality. For maximum daily versatility, an FKM rubber strap in satin finish perfectly complements the chronograph's military character.

Strap replacement is performed by removing the spring bars that connect the case to the original straps. Use a dedicated tool or thin blade to gently compress the spring, then extract the bar. Insert the new 22mm strap and reinsert the spring bar until it clicks securely. Ensure the bar is properly positioned on both sides before wearing the watch.

Yes, completely. The Oris BC4 01 653 7631 4684-Set employs international standards with a 22mm lug width, meaning any quality strap designed for this measurement is compatible. Milano Straps provides a curated selection of artisanal straps in leather, NATO, and rubber, all tested for perfect fit with the Oris case.

A quality leather strap, such as alligator or vegetable-tanned calf, typically lasts 3–5 years of daily wear, depending on exposure to moisture, perspiration, and UV light. The leather naturally develops a prized patina over time. To extend its lifespan, we recommend rotating straps and occasionally applying protective balm. NATO or rubber straps offer superior durability, lasting 7–10 years.