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Casio G-Shock specifications
G Shock GA 100 (module 5081) User manual and a VERY detailed functions overview - YouTube
How to find the User Manual (Setting Instructions) of any Casio or G Shock Watch? - YouTube
CASIO G-SHOCK GW-5500 Radio Solar Digital Watch Org Manual Pre-Own FAST SHIP USA | eBay
Gshock Box Full Set Included Manual + Paper Bag + Square Box + Tin | Shopee Malaysia