Your shopping basket is empty.

If you have tried to add something to your basket but it is still empty, you may be using a browser without cookies enabled. For information on our cookies, please view our privacy policy.

If you would like further assistance please contact our customer service team.

Continue Shopping
0
Your Basket

Compare Watches

Available on checkout
<
>
Casio

Casio G-Shock 'Caution Yellow' Tough Solar B2100 Series

GA-B2100CY-1AER

Seen this product cheaper elsewhere?
Send us a price match request
£119.00
RRP £129.00
Over your budget? Make us an offer!
In stock - International Delivery Click here for full delivery details
Complete with Casio 2 Year Guarantee
Safe & secure transaction
Product Description

Casio is an electronics manufacturing company that was founded in 1946 by Tadao Kashio. The brand has a versatile portfolio, from musical instruments and digital cameras to analogue and digital watches. The company rose to popularity quickly after releasing its first-ever product, a cigarette holder, which proved to be a huge success. Casio became involved in electronics in 1954 when they released Japan's first electro-mechanical calculator. During the “Quartz Revolution” in the 1970s, Casio expanded and became one of the first brands to create quartz watches which solidified the brand as an innovator in horological society. The brand’s timepieces are affordable and long-wearing, making them a favourite to both enthusiasts and everyday people. With the large variety of wristwatches and their commitment to progress, it is no surprise Casio has remained amongst the giants in the industry. 

G-shock is a chic subsidiary of Casio with a cult following. The larger-than-life brand image draws customer after customer who wants to get their hands on an iconic piece of design.  Not only are their watches extremely distinctive but you get superior protection with trademark shock-resistance. A profusion of features, absolute daily reliability and a little bit of attitude all make for an enticing watch. A brand that has been bringing us tough, technologically superior timepieces in stylish, chunky cases since 1983.

Core Features of the Casio G-Shock Carbon Core Octagon:

  • These G-Shock watches are water-resistant up to 20 bars or 200 meters.
  • The hands and the indices of the models are luminescent.
  • This watch pays homage to the original model through its retro-inspired octagonal bezel.

Model Specifications GA-B2100CY-1AER: 

  • The black octagon-shaped case of the digital watch is made of resin.
  • The black dial with yellow accents gives the watch its high-tech appearance. Both the dial and hands have a luminous display. 
  • A hard glass mineral crystal encases the dial.
  • Amongst the many functions featured on the watch are alarms, a day and date, an LED backlight, and a stopwatch alongside a world timer.
  • Once set, an automatic calendar keeps the date display accurate without adjustments.
  • The brand's patented hollow core guard structure protects the watch against shock, impact and vibration.
  • A black silicone strap secures the watch to the wrist. It fastens with a traditional buckle clasp. 
  • This watch is water-resistant up to 200 metres (20 bar). 
  • Movement Type - Solar-powered Quartz.
Protected by Copyscape Online Plagiarism Test
Product Specifications
Gender
Men's Watches
Movement & Power
Solar Powered Quartz
Type
Gift
Features
Date Display, Shock Resistant, Display Backlight, Day Display, Countdown Timer, Bluetooth, Annual Calendar, Alarm
Strap Material
Silicone
Case Material
Plastic (Metal Caseback)
Case Shape
Circle
Display Type
Analog
Dial Colour
Black
Strap Colour
Black
Hour Markers
Batons
Water Resistance
200 metres
Delivery & Returns
Free delivery is available on all UK orders -
For items listed as in stock, your order should be completed before 4:00pm (Monday-Friday) for us to despatch the same day or before 11:30am on Saturday for delivery Monday. Please note that all orders must pass our security policy before they are despatched and we must be able to take payment successfully, if this is not possible we will email or send an SMS with further instructions. For queries and delivery questions please feel free to call us on +441926 298499 (English only).
For other items, a delivery estimate will be shown where possible. If we feel we are unable to adhere to the timescale after you place your order we will contact you to make you aware and allow you to change your order if necessary. Items will be sent by your chosen delivery method once they are back in stock. For UK orders paid by card, Apple Pay or Google Pay we do not charge you until we are about to despatch your order; PayPal, Amazon Pay, Klarna, finance and international orders are charged when the order is placed.
Returns Policy

We aim for you to be absolutely delighted with your purchase and therefore offer you 30 days to change your mind on your purchase. You may do this by using the form provided with your order or otherwise. We will provide a refund of all payment received (not including delivery upgrades), usually within 2 working days of receiving your return (it may take a little longer during busy periods or for more complex returns). This will be made to the original payment method. For most payment methods it will take 3-5 working days for this to show on your statement.

Please ensure items from your order are suitable before wearing as we are unable to accept items which have been worn under our returns policy.

Returns are free on all UK orders. For orders under £500, you may generate a free tracked and insured returns label on the Royal Mail website (opens in a new window). You can print this label and send it back at any local Post Office at no cost to yourself. It is also possible to have the label printed at Post Office using the QR code from the confirmation email. Please retain the proof of postage receipt. Unfortunately we are unable to refund return postage for orders under £500 sent back by other methods, so we recommend printing the free postage label provided. For orders over £500, the Royal Mail label does not cover the value of the item, so please send it back by Royal Mail Special Delivery, insured for its full value, and we will reimburse the postage separately (please keep your proof of postage — full details are on your receipt). Alternatively, contact us and we can arrange a collection. For international returns, you will need to bear the cost of returns postage. Please ensure the watch is returned to us in an unworn, new condition with all the original packaging (manufacturer's manual and guarantee if applicable). Please ensure items from your order are suitable before wearing as we are unable to accept items which have been worn under our returns policy. We reserve the right to make deductions for unnecessary damage caused to the product by yourself.

For UK orders we are also able to offer an exchange to a different product if required, please specify this when returning your product. For international orders, please return the item for a refund and place a new order for the product you would like.

If a fault develops with a watch that is outside of the 30 day returns period or is no longer in a new condition the watch can be returned to the manufacturer under the terms of the guarantee (we are an official UK dealer for all brands on our website) so that they can rectify any issues. For more information please see our returns policy page.

Reviews (2)
Authorised Retailer
First Class Watches SGP are Casio watch retail partners so you can be assured your sparkling new watch will arrive with a stamped manufacturer's warranty, packaging and instructions.
This item is supplied with:
  • Official Casio guarantee
    fully stamped (where appropriate)
  • Instruction manual
    Please note some brands use online manuals
  • Official Packaging
    Official Casio packaging
Please note: Outside of the UK, the duration of the manufacturer's guarantee may be different and therefore you may need to return your watch to First Class Watches in order to get the full guarantee.
2
Customer Reviews
4.5 / 5
Average Rating
5 star (Best) (1)
4 star (1)
3 star (0)
2 star (0)
1 star (Worst) (0)
4 Quality
4 Value
3 Ease of use
5 Style
4
Overall Rating
Perfect, just as ordered.

reviewed 09/01/2026

VERIFIED FIRST CLASS CUSTOMER
5 Quality
5 Value
1 Ease of use
4 Style
5
Overall Rating
I am finding it difficult to to operate this watch Can I exchange for a simpler model

reviewed 28/04/2025

VERIFIED FIRST CLASS CUSTOMER
GET 10% OFF
Your first order with us!
Official UK Retailer - Fast International Delivery
FREE WATCH BRACELET ADJUSTMENT

Code copied to the clipboard!

Please copy the discount code.

Limited editions, sale items, certain brands excluded
Not valid with any other offer
*See privacy policy for how data will be used.

Click here to continue shopping
10% Off x
Chat
Chat
Live customer help
Open Whatsapp Chat
WhatsApp
Live Help