Apple · Watch

Strap for Watch 38mm

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

Integrated bracelet

The Apple Watch MJ3F2LL 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 diameter33 mm
ReferenceMJ3F2LL
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 MJ3F2LL, seen from the bench

The Apple Watch was introduced in 2015 as a multifunctional smartwatch with the watchOS operating system. The device integrates traditional watchmaking functions, chronograph, perpetual calendar and moon phases, as well as smart and fitness tracking capabilities. The MJ3F2LL reference uses the proprietary Apple Watch caliber with a touchscreen display and wireless connectivity.

Frequently asked questions

Can you fit a standard strap to an Apple Watch MJ3F2LL?

The attachment is integral to the case geometry: standard straight-bar lugs will not fit. However, a custom strap exists—handcrafted directly onto your watch by <a href="/pages/casati-booking">Casati Milano</a>, which surveys the case in their atelier and creates a personalised solution that honours Apple's original design.

How does the bespoke strap process work for this model?

The craftsman at <a href="/pages/casati-booking">Casati Milano</a> measures the exact geometry of your lugs, surveys the interlugs spacing, and gauges the curve of the case against skin. Your strap is then constructed to these precise coordinates, with stitching and lugs dimensioned for your wrist—a natural extension of Apple's design language.

Which leather suits the aesthetic character of the MJ3F2LL?

Ceramic white demands leather that maintains constructive simplicity: vegetable-tanned calf with fine grain and naturally evolving patina, cordovan for greater structural rigidity, or deep tones like chocolate brown and black to create formal contrast. Ornamental excess would conceptually betray this model's austere vision.

How long does a well-made strap last?

A bespoke strap crafted from quality leather with correct stitching endures for years, developing a natural patina that enhances its aesthetic character over time. Longevity depends on care and usage, but <a href="/pages/casati-booking">Casati Milano</a>'s construction ensures structural integrity well beyond a decade of daily wear.

Why is the MJ3F2LL a pivotal moment in smartwatch history?

In 2015, the ceramic MJ3F2LL Edition elevated the smartwatch to a material luxury object, matching quadruple-sintered zirconium oxide to Swiss mechanical watchmaking standards. It documents the transition between wearable technology and traditional manufacture, with 33mm proportions echoing vintage chronographs and a formal austerity rarely seen in the segment.

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.

Request an appointment →

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