Strap for BC4 Der Meisterflieger Stainless Steel / Black

The lug width (ansa width) of the Oris BC4 01 649 7632 4164-Set LS is 22mm. This measurement represents the internal distance between the two lugs of the case, at the points where the strap curves. It is essential to verify this dimension before purchasing an aftermarket strap, as an error results in mechanical incompatibility.

For the BC4 01 649 7632 4164-Set LS, we recommend straps that respect the model's avionic heritage. An alligator with vegetable tanning amplifies formal character, whilst a NATO in technical fabric maintains sporting versatility. Satin-finished calf leather represents the elegant compromise between practicality and artisanal refinement. Rubber is ideal for humid environments or water-related activities.

The strap is replaced through the spring bars, small cylindrical pins that secure the strap to the case lugs. Use a spring bar tool for controlled depression: insert the tool into the lug hole, gently press to retract the internal shoulder, extract the old strap. Repeat for the other lug. The operation requires precision to avoid scratching the case.

Yes, the BC4 01 649 7632 4164-Set LS is compatible with any 22mm strap, provided the lugs are correctly shaped. Milano Straps offers a comprehensive collection of artisanal 22mm straps, from premium materials (alligator, shell cordovan) to technical fabrics, all tested for mechanical and aesthetic compatibility with this model.

The lifespan of a leather strap depends on the material, tanning method, and daily use. An alligator with artisanal vegetable tanning maintains structural integrity for 5–7 years of regular wear, developing natural patina. Satin-finished calf guarantees 3–5 years. Rubber resists for 2–3 years before losing elasticity. Ageing is aesthetic (the material changes), not necessarily a defect: many collectors appreciate patina as evidence of time.