Apple · Watch Sport

Strap for Watch Sport 42mm

Integrated bracelet: measurements, the most common questions, and the way to a made-to-measure strap.

Integrated bracelet

The Apple Watch Sport MJ3R2LL is designed with a bracelet integrated into the case. For a compatible made-to-measure strap, the Casati Milano atelier builds it on your watch.

Case diameter36 mm
ReferenceMJ3R2LL
FamilyWatch Sport
MovementApple caliber Apple Watch hours, minutes, seconds, world time | date, day, month, perpetual calendar, week indicator, year indicator | Chronograph | moonphase, Sun position / rising time | alarm | Smartwatch
Year2015
CaseCeramic, Aluminium

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

The Watch Sport MJ3R2LL, seen from the bench

The Apple Watch Sport was launched in 2015 as the entry-level version of the first generation of Apple smartwatches. The device features the Apple Watch movement with chronograph, perpetual calendar, moon phases, and alarm functions. The case is available in aluminum with a fluoroelastomer sport strap.

Frequently asked questions

Can I attach a standard strap to the Apple Watch Sport MJ3R2LL?

No, the bracelet is integrated into the case and the attachment is proprietary to Apple. A standard strap won't fit. What I do in my atelier is craft a bespoke strap directly onto your watch, working within the original Apple connectors.

How does the bespoke strap process work for this model?

We work by appointment only at <a href="/pages/casati-booking">Casati Milano</a>. I take measurements directly from the case and hand-shape the strap to the millimetre, ensuring the click is precise when it engages with the Apple connectors.

Which leather do you recommend for the Apple Watch Sport?

I prefer Tuscan vegetable-tanned leather. It has the right restraint to dialogue with contemporary aluminium, it ages naturally, and it keeps that sportive-elegant character the original Watch Sport design was seeking. The leather lives with whoever wears it.

How long does a well-made strap last?

With daily wear and minimal care—a little cream now and then—good leather lasts years. I don't think in terms of expiry. That leather will become softer, darker, more personal. That's the virtue of natural material.

Why would your atelier work on a tech object like an Apple Watch?

Because the Watch Sport was conceived as an accessory, not just as a tool. Placing noble leather where the Sport Band sits transforms the character of the object—it gives it a different kind of dignity, more handcrafted. What I'm doing is making the original design coherent with how people want to live with it.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only