Meet Casio G-Shock GA-100 (ref. GA-100-A9), a contemporary classic shaped by careful watchmaking know-how. The exterior is thoughtfully executed: crafted in resin and measuring 55 mm in diameter, with a thickness of 16.9 mm, defined by a round silhouette. The caseback is closed, and the crystal is mineral, delivering water resistance to 20000 meters. At a glance, the dial balances texture and clarity: a black tone, framed by stick / dot hour markers, and proprietary hands. At its heart beats a proven engine: the 5081 caliber. With considered ergonomics, it feels composed during extended wear. Brushed and polished elements play with light to emphasize crisp geometry. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.