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You can swim with it. You can jump out of a plane with it. You can run around in circles with it. It's the Casio G-Shock, the Toughest Watch of Them All! Today on Prime Day, you can get yourself a G-Shock at a steal. Black ones, white ones, red ones, blue ones, not ratty old G-Shocks but brand-new ones. Check out some of our faves below.