GMS2100B-8A,Casio launches new G-Shock GM-S2100 metal-clad octagonal watches - NotebookCheck.net News,G-Shock G-Metal GM-S2100B-8AER Metal Covered Lady Watch,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,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