The GA-100A-9A takes one of G-Shock’s most recognisable layouts and commits fully to a single colour. Case, bezel and band are all yellow in a gloss finish, set against a black face — no restraint, no two-tone compromise. It’s a watch that announces itself before it tells you the time.

The GA-100 three-dial design is what gives it depth: a central analog dial flanked by two digital windows, with raised hour markers and stepped dial rings building a genuinely three-dimensional face. At 55mm across and 16.9mm thick it is unapologetically large, and the oversized buttons carry a checkered anti-slip texture so they stay usable with gloves or wet hands.

Underneath is Casio’s module 5081, a quartz movement built for measurement rather than just timekeeping. The 1/1000-second stopwatch records elapsed, lap and split times, with speed and distance readouts aimed at runners and racers. World time across 29 zones, five alarms, a countdown timer and an auto LED light with afterglow round it out — all under G-Shock’s shock and magnetic resistance.

Key Features
Model: GA-100A-9A (Module 5081)
Quartz Analog-Digital – Analog hands with twin digital displays
Shock Resistant – Core G-Shock construction
Magnetic Resistant – Unaffected by everyday magnetic fields
200M Water Resistance – Suitable for swimming and surface water sports
1/1000-Second Stopwatch – Elapsed, lap and split times, with speed and distance readouts
World Time – 29 time zones, 48 cities plus UTC
5 Daily Alarms & Countdown Timer – Practical daily functionality
Auto LED Light with Afterglow – Instant legibility in the dark
Full Auto-Calendar – Pre-programmed to 2099
Accuracy: ±15 seconds per month
Battery: CR1220, approx. 2-year life
Resin Case, Bezel & Band – Gloss yellow with black face
Mineral Glass – Scratch-resistant protection
Case Size: Approx. 55.0 × 51.2 × 16.9mm
Weight: Approx. 70g
Band Width: 22mm

Why Choose the Casio G-Shock GA-100A-9A?

✔ Full-yellow colourway that stands out without needing a limited edition tag
✔ Layered three-dial face with real visual depth, not a flat print
✔ 1/1000-second stopwatch with speed and distance functions
✔ 200m water resistance and G-Shock shock protection
✔ Oversized anti-slip buttons that work in the conditions you’d actually wear it in

Shipping, Returns & Warranty

🚚 Free insured shipping on Australian orders of $150 and above
🌏 International shipping available, including New Zealand at a flat AU$22
🛡️ Covered by manufacturer warranty, with 15-day change-of-mind returns — see our Warranty & Authenticity and Shipping & Returns pages