G-Shock by Casio GAX-100MSA-2A watch. The summer 2017 model of the G-SHOCK G-LIDE lineup of sports watches, which is a favorite choice among the world's top extreme sports athletes. This model is based on the big case GAX-100, whose combination analog-and digital format delivers the information you need in an instant. The GAX-100MSA model was inspired by the ever-changing spectacles on display in the great natural beauty of Hawaii. Semi-transparent resin is formed using mixed color molding that reproduces the twilight gradations reflecting off of a big wave or the ocean surface. Comes equipped with Tide Graph, which is a must for surfers. The GAX-100 has a dial at 10 o'clock that is an analog tide graph. Moon Data and temperature measurement also provide intuitive tide information. Imported.