Strap for UR-105M

No. The bracelet is integrated directly into the case and the attachment won't accept standard lugs. I've seen many owners attempt workarounds—they don't work. For this model, the only serious path is a bespoke strap, tailored to the specific geometry of your case.

You come to the atelier. At <a href="/pages/casati-booking">Casati Milano</a> I take measurements directly from your case and study how the strap must follow the asymmetrical lines of the casing. We work by appointment, Via XX Settembre 15. It's not a quick process, but it's the only way to honour this watch.

I prefer naturally aged Barenia. This model has sporty yet refined character, and Barenia enveillie develops a patina that honours the technical audacity without weighing it down. If you love contrast, Mississippi Alligator with exceptional grain respects the case's asymmetry while maintaining elasticity over time.

With proper care, easily 8–12 years of daily wear. The natural leather we use ages visibly—water marks, signs of wear—and that's part of the story. I recommend not washing it aggressively and removing the watch when you swim. Colour deepens every winter.

Because the case isn't symmetrical. That satellite rotating under the domed crystal determines how the strap must attach and flow on the wrist. I can't ignore this geometry and make a standard strap. I have to think about how the case's movement dialogues with the movement of your wrist.