G-Shock NASA 1983 by a Casio engineer NASA 1983 by a Casio engineer Source:Wiki NASA G-Shock 1983 by a Casio engineer NASA G-Shock’s https://en.wikipedia.org/wiki/G-Shock CASIO G-Shock G-Shock English G-Shock G-Shock G-Shock https://en.wikipedia.org/wiki/G-Shock G-shock English certified by NASA for use in space G-Shock watches