Updated
G-Shock CasiOak vs G-Shock DW-5600
Octagonal analogue-digital or the original square
Quick Verdict
The G-Shock GA-B2100 CasiOak ($100–$150) is a 45.4mm octagonal analogue-digital with Tough Solar power, Bluetooth and world time. The DW-5600 ($50–$100) is the 42.8mm square digital with a battery rated at about two years, an alarm, stopwatch and timer. Both are rated to 200m. The CasiOak never needs a battery; the DW-5600 is smaller and cheaper.
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Specifications Compared
| Feature | Casio G-Shock GA-B2100 CasiOak | Casio G-Shock DW-5600 Square |
|---|---|---|
| Price | $100–$150 | $50–$100 |
| Case Size | 45.4mm (48.5mm lug-to-lug, 11.9mm thick) | 42.8mm (Square) |
| Movement | Quartz Module 5689 (Tough Solar + Bluetooth) | Quartz Module 3229 |
| Caliber Type | Casio Quartz (Solar-Powered) | Casio Digital Quartz (Battery) |
| Power Reserve | About 7 months on a full charge without light; about 18 months in power-saving (Casio) | 2-Year Battery |
| Water Resistance | 200m (20 ATM) | 200m (20 ATM) |
| Crystal | Mineral Glass | Mineral Glass |
| Case Material | Carbon Core Guard Resin | Resin |
| Origin | Made in Japan | Casio (Japan) |
Category-by-Category Analysis
Design & Aesthetics
Octagon against square
The CasiOak has the octagonal bezel and analogue hands that earned it its nickname. The DW-5600 is the classic square digital. These are the two most recognisable G-Shock shapes.
Features & Movement
Solar and Bluetooth against battery
The CasiOak runs Module 5689 with Tough Solar and Bluetooth, adding world time, stopwatch, timer and alarm; Casio rates it at about 7 months on a full charge in darkness. The DW-5600 runs Module 3229 on a battery rated at about two years, with an EL backlight, alarm, stopwatch, countdown timer and flash alert.
Durability & Water Resistance
Both 200m with mineral glass
Both are rated to 200m (20 ATM) and both use mineral glass. The CasiOak case is Carbon Core Guard resin; the DW-5600 is resin.
Wearability & Fit
The DW-5600 is smaller
The DW-5600 is 42.8mm. The CasiOak is 45.4mm across, 48.5mm lug-to-lug and 11.9mm thick. The DW-5600 is the more compact wear.
Value & Cost of Ownership
The DW-5600 is a band cheaper
The DW-5600 sits in the $50–$100 band and the CasiOak in $100–$150. The CasiOak saves on batteries over time; the DW-5600 costs less up front.
Our Verdict
Casio
G-Shock GA-B2100 CasiOak
Choose the CasiOak if you want an analogue face, solar power and phone time-sync. It looks more like a traditional watch and needs no battery changes.
Check Price on AmazonCasio
G-Shock DW-5600 Square
Choose the DW-5600 if you want the original G-Shock shape in a smaller case for less money. It is purely digital and does the basics extremely well.
Check Price on AmazonThe Bottom Line
The Casio G-Shock GA-B2100 CasiOak is a 45.4mm solar-powered analogue-digital with Bluetooth and world time, while the G-Shock DW-5600 is a 42.8mm battery-powered square digital; both are rated to 200m water resistance.
Frequently Asked Questions
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.