GMS2100B-8A,G-Shock debuts GM-2100 and GM-S2100 metal-covered ,METAL COVERED - GM-S2100 | CASIO,METAL COVERED - GM-S2100 | CASIO,GM-S2100 is one of the smallest G-Shocks and Casio markets the series as unisex or women's. But in the wider world of wristwatches, its dimensions fall on the sweet spot for men's