Did you know: The GW-S5600U is the lightest adult G-Shock ever made. However, by replacing the carbon strap with a standard Casio GW-5000 strap you can further reduce the weight by 15%? :
G-Shock Origin GW-5000U-1JF Multiband 6 with DLC
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Casio Black G-Shock 5600 Solar Atomic Watch Gwm5610-1, Men's