Casio
Casio G-Shock GA-2100-1A1ER

Product Information
Overview
The Casio GA-2100-1A1ER is a stylish sports watch that combines the rugged G-SHOCK identity with a minimalist all-black design. The thin yet durable construction with a carbon fiber reinforced case makes it both lightweight and shock resistant - perfect for everyday use, training and harsh environments.
Comfort
The compact 45.4mm design with a thickness of only 11.8mm makes the GA-2100-1A1ER very comfortable to wear all day long. The flexible resin bracelet smoothly shapes itself around the wrist and the buckle makes the watch easy to put on and take off.
Summary
The Casio GA-2100-1A1ER offers a balanced mix of function and style in a slim G-SHOCK format. With features like day and date display, 20 ATM water resistance, and a subtle yet powerful design, this is an excellent choice for those looking for a durable, stylish, and reliable everyday watch.
See more watches from Casio .
Measurements & Material
- Strap material
- Resin
- Diameter
- 46 mm
- Width of bracelet
- 26 mm
- Thickness
- 11 mm
- Glass
- Mineral
- Clockwork
- Quartz
- Caliber
- 5730
Design & Style
- Case color
- Black
- Color of strap
- Black
- Dial color
- Black
- Style
- Sport
- Target group
- Men’s
- Water protection (ATM)
- 20
- Trademark
- Casio
Technical details
- Screw-down crown
- Nej
- Daily alarm
- 1 st
- Features
- Date
- Day display
- Stopwatch
Delivery
For some products, the delivery time is 1–2 business days. Orders placed before 3:30 PM on weekdays are usually shipped the same day and delivered the next business day, depending on your location in the country. For other products, the estimated delivery time is 3–6 business days.
Returns
We want you to feel completely confident when shopping with us. That's why we offer a 30-day right of return from the day you receive your order. If you change your mind about your purchase or if the watch doesn't meet your expectations, you can easily return it for an exchange or refund. For returns, you will conveniently receive a QR code to use for the return process. Read more about the terms and conditions here.
All watches at Kronura come with a minimum 2-year warranty.
What if the watch stops working?
When you shop at Kronura, you can feel secure – we handle the entire warranty process from start to finish. Should anything unexpected happen to your watch during the warranty period, you only need to contact us, and we will take care of the rest.
1. Contact us via email at (Support@kronura.se). Describe the fault as clearly as possible and attach images if possible.
2. Wait for a response from our customer service team, who will get back to you within 1–2 business days with further instructions.
3. We manage the process – Kronura arranges for the watch to be sent to the brand's authorized service center.
4. Resolution and feedback – you will be notified by us when the matter is resolved and the watch has been repaired, replaced, or rectified according to the warranty terms.
Do you need help? We're here for you.
Please contact us if you have questions about:
- Your order
- Products and availability
- Delivery or returns
- Warranty and complaints
- Care and maintenance of your watch
Frequently asked questions
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When your order ships, you will receive a tracking number via email. Delivery is made with Postnord and can be tracked directly on their website.
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We have a watch guide on our website that helps you choose the right size based on your wrist size and personal style.
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Yes, we offer installment payments via Klarna, allowing you to pay at your own pace and feel secure throughout the entire purchase.

