Casio G-Shock GA-100-1A1
Living up to G-Shock's reputation for big case designs, comes a revolution in case size with the introduction of the X-Large G. This Ana-Digi, "three-eyed" GA-100-1A1 monster measure in at a whopping 55 x 51.2 x 16.9mm size, with an attention to detail, that is second to none. Large anti-skid buttons provide easy operation, embossed indexes gives a 3-D look and a rivet bezel design adds strength to its overall appearance
The first G-Shock, the Casio DW-5000C, was designed in 1983 by an engineer working for Casio named Kikuo Ibe.
It was designed to have a 10-year battery life, be water resistant to 10 bar, and survive a 10m fall onto a hard surface.
200 prototypes were tested by dropping them from rooftops or third story windows