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Casio G-Shock GA-2100
Casio
Casio

Casio G-Shock GA-2100

For most people who want a proper G-Shock that doesn’t feel like a brick on the wrist, this slim 'CasiOak' gives real shock and 200m water protection with a dressier octagonal look bulkier models can’t match.

8.2

If you want a tough everyday watch that actually fits under a cuff and won’t get in the way during workouts, the GA‑2100 solves that problem by shrinking G‑Shock toughness into a slim, wearable package without sacrificing core features. It’s the model people call the “CasiOak” because the octagonal bezel makes it look sharper than a typical resin sports watch. ## What makes it worth it The GA‑2100’s carbon-core guard case and shock-resistant construction give genuine G‑Shock durability while keeping the case just 11.8 mm thick and 51 g on the scale, which is far slimmer and lighter than most G‑Shock alternatives — you’ll notice the comfort immediately. It keeps useful everyday functions: analog-digital timekeeping, stopwatch, 24‑hour countdown timer, world time, five alarms, auto-calendar and an LED light, and its 200‑metre water resistance means swimming and surface water sports are no problem. Battery life uses a common CR2016 cell and runs around three years in normal use, so you don’t need frequent service. ## Where it falls short The small digital subdisplay and low-contrast blackout styling make some readouts harder to scan at a glance, and this model lacks the hand‑shift or Bluetooth features found on newer GA‑B variants, so you can’t move the hands out of the way for an unobstructed view or sync time via phone. If you want a thin, rugged daily watch that looks less like a tool and more like a casual sports watch, buy this; if you need easy-to-read digital screens, smartwatch features or constant phone sync, look at GA‑B or Bluetooth-enabled alternatives instead.

£87.96

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Buy if

You want a slim, everyday G‑Shock that keeps real shock resistance and 200m water protection while feeling light under a cuff.

Skip if

You need large, easy-to-read digital readouts or smartphone syncing and hand‑shift features — choose a Bluetooth or GA‑B model instead.

What we found

Case Diameter

45.4 mm

Case Thickness

11.8 mm

Weight

Approx. 51 g

Water Resistance

200 metres (20 bar)

Battery & Power

CR2016, approx. 3 years

Case Construction

Carbon core guard resin case (shock-resistant)

Functions

Analogue-digital; stopwatch, 24h countdown timer, world time, 5 alarms, LED light, full auto-calendar

Strap Material

Integrated resin/silicone strap

watchg-shocksports-watchanalogue-digitalwaterproof

Ready to buy?

£87.96

Buy now