Casio G-Shock GA-2100 “CasiOak”
Collectors nicknamed it the “CasiOak” because the eight-sided bezel echoes a certain Swiss icon that costs several hundred times as much. Underneath is a serious G-Shock: a carbon-reinforced resin case, 200 m water resistance, world time and a 1/100-second stopwatch. At under 12 mm thick, it is one of the slimmest analog-digital G-Shocks Casio makes.
Who it’s for
Someone who wants a tough, good-looking everyday watch that works with jeans or a T-shirt, and who likes the integrated-bracelet look without the price.
Buying tips
- The GA-B2100 adds solar charging and Bluetooth. Decide whether those are worth the extra cost.
- Small hour markers can be hard to read at night. Pick a dial color with good contrast.
- Many colorways exist and limited ones sell at a premium on eBay. If you just want the watch, buy the standard black.
| Brand | Casio |
|---|---|
| Reference | GA-2100-1A1 |
| Case size | 48.5 × 45.4 × 11.8 mm |
| Case material | Resin with carbon core guard |
| Movement | Quartz, Casio module 5611 (analog-digital) |
| Power reserve | About 3 years (CR2025 battery) |
| Water resistance | 200 m |
| Crystal | Mineral glass |
| Production | 2019 – present |
| Typical market price | around $99.00 (estimate; see tracked prices) |
Casio G-Shock GA-2100 “CasiOak” price history
How we measure: eBay figures are the median of matching US listings after removing accessories, parts and statistical outliers. "Asking" means listed prices; "sold" means completed sales. Retailer prices are spot checks. Prices change constantly; confirm on the retailer's site.
