





PRODUCT DETAILS
Upgrade the retro look you love with the octagonal GA-2100 line, inheriting the iconic design concept of the very first G-SHOCK with modern enhancements. This model is equipped with Smartphone Link connectivity and Tough Solar power for reliable, accurate timekeeping.
Built with a Carbon Core Guard structure, the shock-resistant carbon fiber-reinforced resin case offers high strength, lightness, and excellent weather resistance. The dual-layer dial construction highlights the dimensionality of the LCD and inset dial with meticulous textured surface treatments.
Featuring 200-meter water resistance and a high-brightness Super Illuminator double LED light, this watch pairs seamlessly with the CASIO WATCHES smartphone app for automatic time adjustment, world time across over 300 cities, reminders, and phone finder capabilities.
Key Features
| Case size (L× W× H) | 48.5 × 45.4 × 11.9 mm |
| Weight | 52 g |
| Case and bezel material | Carbon / Resin |
| Band | Resin Band |
| Construction | Shock Resistant, Carbon Core Guard structure |
| Water resistance | 200-meter water resistance |
| Time adjustment | Bluetooth: Connects to a smartphone and automatically adjusts the time |
| Power supply and battery life | Tough Solar (Solar powered) |
| Illumination | Double LED light (Super Illuminator) |
| Stopwatch | 1/100-second stopwatch |
| Timer | Countdown timer |
| Alarms | 5 daily alarms |
| World Time | 38 cities |
Highlights
- Shock resistant
- 20 bar water resistant
- Timekeeping functionality
- Stable solar power
- Smartphone connectivity
- Illuminated display for low-light visibility
Frequently asked questions
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PAYMENT METHODS

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SHIPPING & RETURNS
DELIVERY
- We aim to dispatch all in-stock items from our warehouse within 2-5 business days. An email will be sent to you which will include all your tracking information once your order has been handed over to our courier partner.
- If an item is out of stock, we will email you as soon as possible to arrange a full refund or exchange.
- FREE shipping for all orders to any South African address.
- International delivery to Zimbabwe, Namibia and Botswana is available for some brands. Please contact us for a shipping quote.
- Easy 7 days returns and exchanges
RETURNS
If you do not like the product you can return it within 7 days, assuming the item is not worn, scratched or damaged in any way, and includes all the original packaging.
Please contact us for any returns or exchanges
WATER RESISTANCE
Please check the marking on the back of your watch case and refer to the following table to confirm the degree of water resistance of your watch and the preferable conditions of use. A watch’s water resistance is not permanently guaranteed. It is affected by the ageing of gaskets or deformation of watch parts due to accidental shock. To preserve a watch’s water resistance as long as possible, please follow the precautions below:
- Wipe off moisture, sweat or dirt with a soft dry cloth after removing it from the wrist in order to increase the durability of the case back, gaskets and band.
- After using a water resistant watch in ocean water, wash it in fresh water and dry it with a soft cloth.
- Do not wash a water resistant watch while the crown is pulled out.
- Do not operate the crown or press a button when the watch is wet.
- A periodic overhaul service is recommended to check the water resistance of the watch regularly to ensure it’s functionality.
〇:OK,  ✕:Not OK
Type of water resistance | For saturation diving | For scuba diving | Enhanced water resistance for | Water resistance for | Non-water resistance | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Water resistance | Professional Diver's Watch | Diver's watch | 20 | 10 | 5 | 3 | ||||||||
Usage example | Accidental splashes and Contact with rain |   〇 |   〇 | 〇 | 〇 | 〇 |   〇 |   × | ||||||
Swimming, Yachting, |   〇 |   〇 | 〇 | 〇 | 〇 |   × |   × | |||||||
Skin diving |   〇 |   〇 | 〇 | 〇 | × |   × |   × | |||||||
Scuba diving |   〇 |   〇 | × | × | × |   × |   × | |||||||
Saturation Diving |   〇 |   × | × | × | × |   × |   × | |||||||
REVIEWS
Casio G-Shock Retro Black Dial Digital Watch GA-B2100-2ADR
WHY BUY FROM US?
- AUTHORISED ONLINE DEALERThe Watch Boutique is an authorised online stockist for all brands.  This includes a full international warranty.
- FREE AND FAST DELIVERYShipping is free for all orders in South Africa. We dispatch all orders within 2-5 business days.
- SECURE PAYMENT OPTIONSIncluding Buy Now, Pay Later plans with PayFlex and Pay Just Now.
- AFTER-SALES SERVICEWe have a full on-site watch repair workshop to take care of all after-sales needs.
