G-Shock Watch 5600 Series GM-S5600G-7ER. Designed especially with brave adventurers and adrenaline junkies in mind, G Shock watches are made to be entirely shock proof along with fantastic robustness and multifunctionality including chronograph function, water resistance and more. The G Shock watch brand was first founded by engineer Kikuo Ibe in 1983 shortly after he broke his fatherÕs pocket watch. From that moment, he decided there was a gap in the market for a collection of strong outdoor watches that were almost unbreakable.