Apple · Watch

Strap for Watch 42mm

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

Integrated bracelet

The Apple Watch MJ452LL 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
ReferenceMJ452LL
FamilyWatch
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, Stainless Steel

Spring bar

Swiss Standard universal spring bars

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

The Watch MJ452LL, seen from the bench

The Apple Watch was introduced in 2015 as a multifunctional smartwatch with the watchOS operating system. It integrates the Apple Watch caliber with chronograph, perpetual calendar, moon phases and alarm functions. The MJ452LL reference offers wireless connectivity and physical activity monitoring through dedicated sensors.

Frequently asked questions

Can a standard strap be fitted to the Apple Watch MJ452LL?

No, the MJ452LL does not accept standard straps with straight spring bars: the attachment is proprietary and integral to the case. However, you can have a strap built to measure directly on your watch by <a href="/pages/casati-booking">Casati Milano</a>, which measures the exact dimensions of your wrist and case, creating a bespoke strap calibrated precisely for this model.

How does the made-to-measure strap construction work for the MJ452LL?

During your atelier session, <a href="/pages/casati-booking">Casati Milano</a> records your wrist measurements and the case attachment specifications. The strap is then handcrafted with your watch as the reference model, ensuring perfect fit and correct weight distribution. This is not adaptation, but bespoke creation designed for your wrist and your watch.

What type of leather suits the character of the Apple Watch MJ452LL?

The MJ452LL, with its minimalist and austere design, demands leathers that respect this aesthetic integrity. Vegetable-tanned leather with visible natural grain and patina that develops over time conveys the same conscious durability as the ceramic and steel case. Satinised nubuck or crocodile can also work, provided the choice emerges from narrative coherence with the design, not from a generic catalogue.

How long does a made-to-measure strap for the Apple Watch last?

A strap crafted with artisanal quality, selected materials, and proper construction techniques can last for years. Longevity depends on leather quality, daily use, maintenance, and embracing natural patina rather than pursuing artificial perfection. A bespoke strap ages with intent, becoming more characterful as time passes.

Why is the MJ452LL significant in watchmaking history?

In 2015, the MJ452LL represented the first truly purposeful digital wristwatch designed to endure beyond a single technology cycle: it was not merely an extension of the smartphone, but a device with a vocation for communication and monitoring. The tapered 36mm square case and the movement rich in complications—chronograph, lunar phases, Sun position, perpetual calendar—translated the heritage of haute horlogerie into digital language, redefining what a contemporary watch could be.

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