Casio G-Shock Analog-Digital Watch GA2100RRB-4A RedCasio G Shock Analog Digital Watch GA2100RRB 4A Red The Casio G Shock GA2100 nicknamed "CasiOak" for its octagonal bezel that echoes a much more expensive watch. One of the thinnest G Shocks in the lineup at 11. 8mm, with a carbon core guard structure that keeps it light and strong. Analog digital display, 200m water resistance, and the full G Shock feature set. The one that brought a new generation into G Shock. Specs Carbon Core Guard structure thin