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
G30052+G-shock+Ga-2000-2adr+Casio+Watch+5590 for sale online | eBay
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GA-2000 Carbon Core Guard G-Shock tutorial - how to setup & use ALL the functions on the 5590 module - YouTube