Strap for BC4 Small Second Day DLC / Black

This model features a 22mm lug width, the international standard for professional chronographs. This specification provides access to an extensive selection of compatible aftermarket straps in leather, NATO, rubber, and shell cordovan.

The choice depends on your intended use. For an authentic tool-watch aesthetic, we recommend vegetable-tanned leather (which develops patina over time) or canvas NATO straps in ballistic weave. For formal occasions, alligator or satin-finished calf amplify refinement without compromising the case's functional character.

Remove the lug bars using a dedicated spring bar tool or by visiting a qualified watchmaker. The bars should be extracted outward; remove the old strap and insert the new one by sliding the bars into the appropriate holes on the new lug assembly. The operation requires care to avoid scratching the case.

Yes, compatibility is permanent. The 22mm lug width is an established international standard. Any artisanal strap manufactured to this specification will remain compatible indefinitely, regardless of wear or patina development over time.

Under normal use conditions and periodic maintenance (cleaning and occasional conditioning), a high-quality artisanal vegetable-tanned leather strap typically lasts 3-5 years before replacement becomes necessary. Durability varies depending on climate, moisture exposure, and frequency of wear. Natural patina and cracking indicate aesthetic evolution, not deterioration.