Strap for Big Bang Original 41 Stainless Steel - Ceramic / Black / Rubber

No. The bracelet is integrated into the case: the lugs follow a proprietary geometry that accepts no standard strap. An off-the-shelf aftermarket strap simply will not attach — it is physically incompatible. The only way forward is to build the attachment by hand, directly on the watch, as I do in the atelier.

I work exclusively by appointment at <a href="/pages/casati-booking">Casati Milano</a>, at Via XX Settembre 15 in Milan. I bring the watch to the bench, study every millimetre of the lug profile and shape each connector by hand. There are no ready-made templates: every strap is built from scratch on that specific case.

I favour matte black Mississippi Alligator. The ceramic has a dense, almost industrial texture, and a matte black leather works with that character without overpowering it. Those who want a sharper contrast might choose natural Barenia: its warm ivory tone cuts through the dark architecture of the case in a deliberate way. It depends on how much you want the strap to stand out.

With quality leather and basic care — keeping it away from water, letting it breathe between wears — I easily reach five to seven years of regular use. The leather does not deteriorate: it marks, softens and takes the shape of the wrist. After a few years a good strap tells a story, and to me that is a quality, not a flaw.

The hex-screwed bezel and variable-geometry lugs leave no room for approximation. Every screw, every angle of the case dictates how the strap must meet it. When Biver launched the Big Bang in 2005 with the Art of Fusion philosophy — ceramic, steel and resin together — he was not simply choosing materials: he was building a geometry that forces anyone working in leather to think from scratch every single time.