This is a model from the G-Shock Mudmaster Series, designed for use in extreme environments scattered with rubble, dirt and debris, and uses carbon materials.
Model #: GGB100-1A9
Case size: 55.4 × 51.3 × 19.4 mm
 
Case and bezel material :Carbon / Resin 
 
Construction: Shock / Mud resistant/                        Carbon Core Guard structure 
 
Water resistance:200 meter