Casio G-Shock GA-2100 (CasiOak) vs G-Shock GMW-B5000
Buy the GA-2100 if you want a tough, slim everyday watch at a low price. Buy the GMW-B5000 if you want a steel-bodied G-Shock with solar power and atomic timekeeping and will pay for it. As of November 4, 2026, the GA-2100 starts at $85.00 at eBay (it dipped to $65.00 on October 29), while the GMW-B5000 starts at $440.00 at Casio America. That is roughly a $355 gap for the same 200 m water resistance and shock protection.
Today the Casio G-Shock GA-2100 (CasiOak) costs $345.00 less at its best price.
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Casio G-Shock GA-2100 (CasiOak)
4.3Choose the GA-2100 if you want a slim, light, low-cost G-Shock you can wear to work and beat on without worry.
- Slim 11.8 mm case sits flatter on the wrist than most G-Shocks
- 200 m water resistance and shock-resistant resin build at $85.00
- Analog-digital dial with night light and Bluetooth time setting
- All-gray look works with work wear
What separates them
| Casio G-Shock GA-2100 (CasiOak) | G-Shock GMW-B5000 | |
|---|---|---|
| Price (best new) | $85.00 at eBay as of November 4, 2026 | $440.00 at Casio America as of November 4, 2026 |
| Case and band material | Resin case and resin strap | Stainless steel case and solid stainless steel band with one-touch 3-fold clasp |
| Power | Quartz battery | Tough Solar, self-charging from light |
| Timekeeping | Bluetooth link to phone for automatic time setting | Multi-Band 6 radio control plus Bluetooth sync via the CASIO WATCHES app |
| Case thickness and size | 11.8 mm thick, 45 mm case | 43 to 44 mm case, steel build |
| Display | Analog-digital with baton indices | Digital only |
| Alarms and timers | Alarm, stopwatch, day display |
Price history
- Casio G-Shock GA-2100 (CasiOak): lowest $65.00 on Oct 29; $104.94 on Nov 4.
- G-Shock GMW-B5000: lowest $440.00 on Nov 4 at Casio America.
Prices at every store
Casio G-Shock GA-2100 (CasiOak)
- Macy'sNew
In stock
$110.00Free shippingObserved at 10:42 PM - eBayPre-owned
Availability unknownSold by chronoshadeoutlet (99.7% positive, 2,600 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
$89.99Free shippingVerified - eBayNew
Availability unknownSold by chronoshadeoutlet (99.7% positive, 2,600 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
$95.00Free shippingVerified - AmazonNew
Availability unknown
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$104.94Free shippingObserved at 10:42 PM
Also available at
- BuckleCheck price at Buckle
- NordstromCheck price at Nordstrom
- WalmartCheck price at Walmart
Specs compared
| Spec | Casio G-Shock GA-2100 (CasiOak) | G-Shock GMW-B5000 |
|---|---|---|
| Case Size | 45 mm | 43mm case, 43.2mm case, 44mm case |
| Water Resistance | 200 m (20 ATM) | 200 meters |
| Band Material | Resin | Solid stainless steel band, One-touch 3-fold Cl… |
| Display | Analog-Digital | Digital |
| Water Resistant | Yes | Yes |
| Connectivity | Bluetooth | Bluetooth |
| Model | Casio G-Shock GA-2100-1A1 Price: ~– ASIN: B0DSW… | Casio G-Shock GMW-B5000D-1 Price: ~– ASIN: B07D… |
| Bezel Color | Gray | — |
| Closure | Buckle | — |
| Dial Pattern | Solid |
What reviewers say
Casio G-Shock GA-2100 (CasiOak)
Owners widely praise the CasiOak as a tough, good-looking daily watch that punches far above its price. The common complaints are the size on slim wrists and the plastic feel of the case and strap.
- Toughness and shock resistance for the money
- Slim profile compared with other G-Shocks
- Octagonal design that looks more expensive than it is
- Legible analog-digital dial
- Large 45 mm case on smaller wrists
- Resin strap can feel stiff and plasticky
- No solar or Bluetooth on the base model
G-Shock GMW-B5000
Owners of the metal square tend to praise the build and the blend of old-school G-Shock design with solar and Bluetooth. The main complaints are weight and the mineral crystal.
Questions and answers
- Is the GMW-B5000 worth the extra over the GA-2100?
- Only if you want steel, solar charging and atomic timekeeping. The GA-2100 gives you the same 200 m water resistance and shock protection for $85.00 at eBay versus $440.00 at Casio America.
- Which is better for swimming?
- Both are rated to 200 m, so either handles swimming and snorkeling. The GA-2100's resin strap dries faster; the steel bracelet on the GMW-B5000 holds water longer.
- Which lasts longer?
- The GMW-B5000 has an edge because Tough Solar removes battery changes and the steel case resists wear. The GA-2100's resin will scuff and its battery will eventually need replacing.
- Which is better for small wrists?
- The GMW-B5000, with a 43 to 44 mm case. The GA-2100 is 45 mm wide, though its 11.8 mm thickness keeps it from sitting tall.
- Do both connect to a phone?
- Yes. Both use Bluetooth, but the GMW-B5000 also syncs by radio signal from six transmitters worldwide, so it keeps accurate time without a phone.
- Which has more functions?
- The GMW-B5000: 5 daily alarms with snooze, a 1/100-second stopwatch and a 24-hour timer. The GA-2100 covers the basics plus analog hands.
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