Casio G-Shock watch movements or calibers are called modules. It sounds fancy, but when you read that a specific GShock watch model has a certain module, they are talking about the movement inside. These modules are essentially just digital (and sometimes ana-digi) quartz movements. How to find the module number? The module number can be
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Casio G-Shock Instruction Manual Directory by Model Name - G-Central G-Shock Fan Site
The History of the Casio G-Shock
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Full G-SHOCK Model List, 2024 Updates
Full G-SHOCK Model List, 2024 Updates
Full G-SHOCK Model List, 2024 Updates
G-Shock GMA-S140 / 5613 / Compact motif of the 1990 for Girls
G-SHOCK GBA-900, All Models, 2021 – 2024