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
Casio G-Shock Database
LTP-V007L-7B1
DW-5600BB-1, G-SHOCK DIGITAL 5600 SERIES
The Complete Buying Guide to Casio G-Shock Watches: The Vast Collection, Explained
G-Shock Modules - List of Casio GShock Movements and Models
Timepieces (Watches)
G-Shock Modules - List of Casio GShock Movements and Models
G-Shock Modules - List of Casio GShock Movements and Models
GA-2100-1A1, G-SHOCK ANALOG-DIGITAL GA-2100 SERIES
G-Shock Modules - List of Casio GShock Movements and Models
The History of the Casio G-Shock
GA-2100-1A1, G-SHOCK ANALOG-DIGITAL GA-2100 SERIES