Strap for Oris BC4 01 690 7615 4154

The BC4 features a 22-millimetre lug width. This dimension is the only correct specification for this model and must be measured precisely using a digital calliper between the inner edges of the original watch lugs. No compromise is permitted on this specification: a strap of different width will not fit correctly into the watch's lug holes.

This depends on intended use. For formal elegance, an alligator with vertical grain or developed patina creates impeccable proportions and manages thermal comfort. For robust daily wear, vegetable-tanned calf offers durability and develops authentic patina over time. For pure technical heritage, an ecological NATO fabric remains the choice most coherent with the BC4's military legacy, ensuring practicality and quick-change capability.

The Oris BC4 is equipped with fixed lugs (non-adjustable), so strap replacement requires extraction of two spring bars, one on each side. Use a dedicated spring bar removal tool or a fine needle: gently push the spring inward to free the lug from the case ear. Proceed with care to avoid damaging the case. Once the spring bars are released, slide out the old strap and insert a new one of correct 22mm width, verifying that the spring bars engage completely.

Yes. Any artisanal strap designed for 22mm lug width is technically compatible. Compatibility is ensured by correct lug width and proper lug hole configuration. However, it is essential to verify that the chosen strap is not excessively thick (typically maximum 4–4.5mm) to prevent friction at attachment points. We recommend straps in alligator, calf, NATO, or rubber certified for this specification.

Lifespan depends on construction quality and usage intensity. A high-grade alligator or calf strap, worn daily, typically offers 4–6 years of useful life before replacement is required. A NATO or rubber strap lasts significantly longer owing to the absence of articulation points and reduced exposure to torsional stress. The practice of rotating multiple straps (recommended technique) extends the longevity of each by distributing wear load.