GMA-S2100 series | marker pen | GMA-S2100 series downsizes the GA-2100 to create a simple and slim design. The octagonal bezel, flat face, simple bar hour markers, and carbon core guard...
Mini Casioak GMA-S2100 vs Full Size GA-2100 - Measurements and Other Differences - YouTube
Casio G Shock GMA-S2100. Great for Small Wrist? - YouTube