G-Shock Black Watch GMAS2100-1A,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,GMS2100MF-1A | G-SHOCK Metal Covered Black | CASIO,METAL COVERED - GM-S2100 | CASIO,38KB