Casio G-Shock Octagon Series ‘CasiOak’ Quartz Digital Black Resin Strap Men's Watch GA-2100-1A2ER
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Casio G-Shock Octagon Series ‘CasiOak’ Quartz Grey Dial Grey Silicone Strap Men's Watch GA-2100-1A2ER
The Casio G-Shock GA-2100-1A2ER, also known as the "CasiOak," is a striking fusion of G-Shock's signature durability and a sleek, modern design. Drawing inspiration from classic G-Shock aesthetics but with a refined twist, the GA-2100-1A2ER features an octagonal bezel that is both bold and stylish. Ideal for adventurers, watch enthusiasts, or anyone in search of a rugged timepiece that doesn't compromise on style, this watch is built to endure while keeping you on time.
Design & Features
Dial & Display
Dial Color: Grey with Blue Accents – A modern and understated design, perfect for both casual and sport settings.
Display Type: Analog-Digital Hybrid – A versatile display combining traditional analog hands with a digital readout for multifunctional convenience.
Case & Build
Case Diameter: 49mm – A bold, masculine size while still being comfortable for most wrist sizes.
Case Thickness: 12mm – A slim profile for a G-Shock, maintaining comfort without sacrificing durability.
Strap & Comfort
Strap Material: Resin – Soft, flexible, and water-resistant, offering all-day comfort for active wear.
Clasp: Buckle Closure – Secure, adjustable fit for maximum comfort and wearability.
Lightweight Build: Despite its robust construction, the GA-2100-1A2ER is light on the wrist, making it suitable for everyday wear and sports activities.
Movement & Performance
Movement: Quartz (Module 5611) – Offers precise timekeeping with minimal maintenance.
Water Resistance: 200 meters (20 ATM) – Suitable for swimming, snorkeling, and professional marine activity.
Specifications
Brand: Casio G-Shock
Series: Octagon / CasiOak
Model: GA-2100-1A2ER
Movement: Quartz (Module 5611)
Case Material: Carbon-Resin
Case Dimensions: 49mm
- Case Thickness: 12mm
Dial Color: Grey
Crystal: Mineral Glass
Strap Material: Resin
Water Resistance: 200m (20 ATM)
Key Features
World Time & Stopwatch – Perfect for globetrotters and those needing precision in tracking time.
200m Water Resistance – Ready for swimming, snorkeling, and marine activities.
Who Is It For?
Style-Conscious Watch Enthusiasts – Ideal for those who want a bold, fashionable timepiece.
G-Shock Fans & Collectors – A must-have addition to any G-Shock collection, blending modern design with classic toughness.
Outdoor Adventurers – Durable and equipped with features ideal for harsh conditions.
Active Sports & Fitness Lovers – Lightweight, shock-resistant, and water-resistant, perfect for an active lifestyle.
Everyday Wearers – A versatile timepiece for those who need a reliable watch that pairs with any outfit.
Final Thoughts
The Casio G-Shock GA-2100-1A2ER "CasiOak" is a standout in the G-Shock lineup, offering a blend of timeless durability, modern aesthetics, and advanced features. Whether you’re looking for a watch that can handle the outdoors or simply need a statement piece that performs as well as it looks, the GA-2100-1A2ER offers everything you need, and more. With its shock resistance, water resistance, and sleek design, this watch is the perfect companion for both adventure and everyday wear.
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Delivery Information
UK Shipping
We are pleased to offer FREE shipping on all UK orders. All items sent to UK customers are fully insured for added peace of mind.
The table below provides a breakdown of our shipping rates based on the selling price of your order, including VAT and any discounts.
| Selling Price | Royal Mail 48 Tracked |
Royal Mail 24 Tracked & Signed |
Special Delivery Next Day Orders placed Mon–Fri |
Special Sunday Delivery Orders placed before Saturday 12pm |
Royal Mail Special Delivery By 1pm |
|---|---|---|---|---|---|
| £0 to £99.99 | FREE | £4.99 | £7.99 | £7.99 | £9.99 |
| £100 to £499 | N/A | FREE | £7.99 | £7.99 | £9.99 |
| £500 or more | N/A | N/A | FREE | £7.99 | £9.99 |
We know your order is important to you, so we use Royal Mail’s tracked delivery service on all UK orders.
We also offer Royal Mail Special Delivery, which for an additional fee offers guaranteed delivery the next day before 1pm.
*Royal Mail Tracked 24 and Royal Mail Tracked 48 services are 98% accurate but not guaranteed.
UK orders placed before 4pm Monday–Friday are dispatched the same day. Orders placed on Saturday or Sunday are dispatched on the following working day.
We are not open during UK bank holidays. Orders received on bank holidays will be dispatched promptly the next working day.
International Shipping & Duties
We’re pleased to offer worldwide delivery with fully tracked and insured shipping.
To make international delivery clearer, our shipping terms vary depending on the delivery country. Some destinations are shipped with duties and taxes included, while others may require local import charges to be paid before delivery.
DDP Destinations
For orders delivered to the USA, Canada and the European Union countries listed below, we ship on a DDP (Delivered Duty Paid) basis.
This means the price you pay at checkout includes:
- Your goods
- International shipping
- Applicable import duties
- Applicable taxes/VAT
- Customs clearance charges where applicable
Duties and taxes are included at checkout for the countries listed below. This means you should not be asked to pay additional import fees before delivery.
Countries currently shipped with duties and taxes included
North America
- United States
- Canada
European Union / Eurozone
- Austria
- Belgium
- Bulgaria
- Croatia
- Cyprus
- Estonia
- Finland
- France
- Germany
- Greece
- Ireland
- Italy
- Latvia
- Lithuania
- Luxembourg
- Malta
- Netherlands
- Portugal
- Slovakia
- Slovenia
- Spain
European Union / Non-Euro Currency Countries
- Czech Republic / Czechia
- Denmark
- Hungary
- Poland
- Romania
- Sweden
If your delivery country is listed above, duties and taxes are included at checkout and you should not be asked to pay additional import duties or taxes before delivery.
Please note that delivery times can still vary if customs require additional checks, but any applicable duties and taxes should already be covered where DDP has been selected and charged at checkout.
Rest of World — DAP
For all other international destinations outside of the countries listed above, orders are shipped on a DAP (Delivered At Place) basis.
This means the price you pay at checkout covers:
- Your goods
- International shipping
It does not include overseas sales tax, import VAT, customs duties, tariffs, or courier clearance/handling fees.
When your order reaches your country, local customs authorities may apply additional charges, including:
- Import VAT or local sales tax
- Customs duties or tariffs
- Courier handling or clearance fees
These charges are set by your country’s customs authority and are payable by you before delivery.
If charges are due, you’ll usually be contacted directly by the courier with a secure link to pay any applicable fees. Once cleared, your parcel will be released for delivery.
Estimated Delivery Times After Dispatch
Customs processing times vary by country and may extend delivery slightly.
If Import Charges Are Not Paid
For DAP shipments, if local import charges, taxes, duties or courier fees are not paid, or if delivery is refused, the parcel may be returned to us.
In this case, we will refund your order minus:
- The original outbound shipping cost
- Any return shipping fees charged to us
- Any customs, duty, tax or clearance fees billed to us by the courier
Estimating Import Costs for DAP Countries
Import VAT, duty and tariff rates vary by country. For an estimate, please contact your local customs authority or use your government’s official import calculator before placing your order.
If your delivery country is listed as a duties and taxes included destination above, your order will be shipped on a DDP basis.
More about delivery...
Need help?
Frequently Asked Questions
Yes — we are an Authorised Dealer for every brand we sell. All watches come with an official box, papers, and a full manufacturer’s warranty.
Every watch includes a manufacturer warranty. You’ll find more warranty info listed in the product description.
Orders placed before 5pm (Mon–Fri) are dispatched the same day. Order before 12pm on Sat for same-day dispatch. Free UK delivery is available on all orders, and tracking details are provided once shipped.
Yes — you have 14 days from delivery to return or exchange your item, provided it’s unused and in its original packaging.