Casio · G-Shock GA-100

Strap for GA-100A-9A Bumblebee

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

Integrated bracelet

The Casio G-Shock GA-100 GA-100-A9 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 diameter55 mm
ReferenceGA-100-A9
FamilyG-Shock GA-100
MovementCasio caliber 5081 world time | perpetual calendar | Chronograph, countdown | alarm
CaseResin

Spring bar

Swiss Standard universal spring bars

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

The G-Shock GA-100 GA-100-A9, seen from the bench

The GA-100A-9A Bumblebee is a G-Shock model featuring a 55mm resin case designed for extreme durability. This iconic timepiece combines Casio's robust engineering heritage with contemporary street style. Milano Straps offers custom-fitted straps developed by Atelier Casati Milano, including Tuscan vegetable-tanned leather and premium NATO options tailored to the watch's integrated lug geometry.

Frequently asked questions

Can I attach a standard strap to the Casio G-Shock GA-100 GA-100-A9?

No, the bracelet is integrated into the case and the attachment is proprietary — a standard strap won't fit. That's where we come in: I craft a bespoke strap directly on your case geometry, with no shortcuts.

How does the bespoke strap work for the GA-100?

We work by appointment only at <a href="/pages/casati-booking">Casati Milano</a>, Via XX Settembre 15 in Milan. I take measurements directly from your watch case, develop the custom interface, and build the millimetric strap. It's the only way I know to do it properly.

Which leather do you recommend for the G-Shock GA-100?

I prefer vegetable-tanned Tuscan leather: it ages with character, developing a patina that reflects the military-sport soul of this watch. If you want something more contemporary and sustainable, premium NATO in regenerated yarns enhances the technical ethics of the G-Shock without sacrificing elegance.

How long does a well-made strap last?

With active use, a handcrafted strap lasts 4-6 years, sometimes longer. It depends on your exposure and how you care for it — vegetable leathers dislike water stagnation. If you dry it properly and treat it with respect, it'll follow you for years and age better than you'd expect.

Why does the G-Shock GA-100 deserve a bespoke strap?

Born in 1983 as a symbol of extreme durability — 10 metres of free fall, 10 bar pressure resistance. The GA-100 brings this philosophy in 55mm of pure attitude. Replacing the integrated bracelet with a custom strap isn't compromise: it's respect for the engineering on your wrist and your personal taste.

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