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The Casio G-Shock GA100-1A4 is an oversized ana-digi watch with a 51mm resin case, a black dial with red accents, and a 200-meter water resistance rating. It combines analog hands with a digital display and packs world time across 48 cities, a 1/1000-second stopwatch, a 24-hour countdown timer, four daily alarms and a seven-year CR2025 battery. Its anti-magnetic construction and shock-resistant build suit people who want a tough everyday or sports watch without charging or app pairing. Against slimmer G-Shock models it is bulkier and more feature-dense, and owners rate it highly for durability and legibility rather than subtlety.
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Owners rate the GA100-1A4 highly, praising its toughness, clear display and long battery life. Criticism centers on its size and the busy, hard-to-read-at-a-glance dial.
The Casio G-Shock GA100-1A4 is an extra-large analog-digital watch with an anti-magnetic design. It has a 51mm case that is 17mm thick, a fixed bezel and textured function pushers. The caseback is secured with four screws and the watch is water resistant to 200 meters.
The strap is black resin with a buckle clasp. The dial is black with index hour markers and is protected by scratch-resistant mineral crystal. A Japanese-made quartz movement powers it.
It has an auto LED light with afterglow and world time for 29 time zones (48 cities plus UTC), with daylight saving on/off and home city/world time swapping. It also has a countdown timer, a 1/1000 second stopwatch, an hourly time signal, an auto calendar, 4 daily alarms and 1 snooze alarm.
