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Built for extreme durability and everyday performance, the Casio G-Shock GA100-1A2 combines rugged toughness with a bold black and blue design. Featuring G-Shock's legendary shock-resistant construction, magnetic resistance, and 200-metre water resistance, this watch is designed to handle demanding environments while maintaining its striking oversized appearance.
The large 55mm case houses an easy-to-read analogue and digital display with G-Shock's signature three-dial layout, offering a powerful combination of style and functionality. Whether you're travelling, training, working outdoors, or simply looking for a tough everyday watch, the GA100-1A2 delivers reliable performance with advanced features including world time, a 1/1000-second stopwatch, countdown timer, multiple alarms, and LED illumination.
The matte black resin construction is accented with vibrant blue detailing, creating a sporty and modern look that stands out on the wrist while maintaining the toughness G-Shock is known for.
Shock Resistant construction
Magnetic Resistant
200 Metre Water Resistance
Analogue & Digital Display
Super Bright LED Light with Afterglow
World Time – 48 Cities / 29 Time Zones
1/1000 Second Stopwatch
Speed Measurement Function
Countdown Timer
5 Daily Alarms (including Snooze Alarm)
Full Auto Calendar to 2099
12/24 Hour Format
Mineral Glass
Resin Case & Band
Approx. 2-Year Battery Life (CR1220)
| Feature | Details |
|---|---|
| Brand | G-Shock |
| Model | GA100-1A2 |
| Movement | Quartz |
| Display | Analogue / Digital |
| Case Material | Resin |
| Bezel Material | Resin |
| Band Material | Resin |
| Glass | Mineral Glass |
| Water Resistance | 200 Metres |
| Shock Resistance | Yes |
| Magnetic Resistance | Yes |
| LED Light | Auto LED Light with Afterglow |
| World Time | 48 Cities, 29 Time Zones |
| Stopwatch | 1/1000 Second |
| Countdown Timer | Up to 24 Hours |
| Alarms | 5 Daily Alarms |
| Calendar | Fully Automatic to 2099 |
| Accuracy | ±15 Seconds Per Month |
| Battery | CR1220 |
| Battery Life | Approx. 2 Years |
| Case Size | 55 × 51.2 × 16.9 mm |
| Weight | Approx. 70g |
Free express shipping on New Zealand orders over $100, dispatched within 1–2 business days. Same-day Click & Collect is available from our Ōtāhuhu, Auckland showroom — choose Click & Collect at checkout.
Covered by the official manufacturer’s warranty against defects in materials and workmanship. Every item sold by Stonex Jewellers is 100% authentic and brand-new.
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