5611 Module: Analog/Digital Features of Casio G-Shock GA-2100 Carbon Core Guard - YouTube
G-Shock GA-2100 / 5611 / Octagon Form in a Slim 11.8mm Case
Just bought my first g-shock (GM-2100MF). Love the way it looks but concerned it's a fake. The internal module number (during testing mode) shows up as 5590 instead of 5611. Anybody else
G-Shock introduces the thin GA-2100 Carbon Core Guard