G-Shock

The first G-Shock was designed in 1983 by an engineer working for Casio named Kikuo Ibe. The shock resistant design has 10 layers protecting the quartz timekeeping module, including a urethane rubber bumper, the stainless steel case, the hardened mineral glass watch crystal, the stainless steel screwed down case back, and the "floating module" where the quartz mechanism floats free in a urethane foam cradle, with the outer buttons and LCD module attached with flexible cables.