
Ref. GA-B2100 · Sport
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G-Shock collection · 101 watches
2 colorways
The market
The forum market
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Casio on the secondhand market
+10.5%
2026 so far · +1.3% to +21.6% · 47 matched watches
In line with the index
Year-by-year readings →The connection engine
The community take
Owners widely praise the Casio GA-B2100 for its "Casioak design," solar charging, and Bluetooth connectivity, with many calling it the best in its series for its legible dial, slim and comfortable fit, and solid build quality. The dial features a nice sheen that conceals solar cells, sharp text, and a colorful, useful red indicator hand, while the hands have good lume, though markers lack it. One owner notes the 45.5mm width is well-designed with a symmetrical look due to the lack of a crown. Some owners report issues with charging not progressing past M, failure to time sync automatically for extended periods, or a misaligned mode hand. One owner feels the Casio GA-B2100 is functionally unimpressive for its $130 price point. Overall, owners rate the Casio GA-B2100 highly for its combination of iconic design, solar charging, and Bluetooth utility.
On real wrists · 1
The paper trail
The discussion