
Casio Tough Solar Power Green Digi-Analogue Resin Strap Men's Watch AQ-S820W-3BVEF
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The Casio AQ-S820W-3BVEF is a robust analogue-digital sports watch that combines solar-powered reliability with practical functionality and everyday versatility. Inspired by aircraft instrument panels, its green resin strap and round black-dial case create a rugged, outdoor-ready aesthetic while maintaining a clear, easy-to-read display. This model reflects Casio’s focus on delivering dependable performance with thoughtful design for active lifestyles.
Tough Solar Power and Efficient Timekeeping
Powered by Casio’s Tough Solar technology, the watch harnesses energy from natural and artificial light to maintain operation without conventional battery changes. A battery power indicator and power-saving function extend the watch’s endurance, with typical power reserves lasting around 10 months under normal use and up to 23 months in power-save mode after a full charge. The analog hands show hours and minutes, while the LCD panel presents day, date and additional functions for comprehensive timekeeping.
Durability and Water Capability
Built for resilience, the case and resin strap contribute to a lightweight yet sturdy construction measuring approximately 52.5 × 50.1 × 12.7mm with a total weight around 46g. Water resistance to 100 metres (10 bar) permits swimming and daily water exposure with confidence, reinforcing its suitability for daily wear, travel and outdoor activities.
Functional Features for Daily Use
The AQ-S820W-3BVEF delivers a host of practical features including world time across 31 time zones (48 cities + UTC) with daylight saving on/off, a 1/100-second stopwatch, two countdown timers, five daily alarms with hourly signal, and a full automatic calendar through 2099. An LED backlight with selectable illumination duration ensures visibility in low-light conditions, while selectable 12/24-hour formats and optional button tone mute add everyday convenience.
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UK Delivery
| Selling Price | Royal Mail 48 (Tracked) |
Royal Mail 24 (Tracked & Signed) |
Special Delivery Next Day (Mon – Fri) |
Special Sunday Delivery (Before Sat 12pm) |
Royal Mail Special Delivery by 1pm |
|---|---|---|---|---|---|
| £0 to £99.99 | FREE | £4.99 | £7.99 | £7.99 | £9.99 |
| £100 to £499.99 | 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 service, 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.
Orders placed before 5pm (Monday–Friday) are dispatched the same day. Orders placed on Saturday or Sunday are dispatched the following Monday.
International Shipping & Duties (Delivered At Place – DAP)
We’re pleased to offer worldwide delivery with fully tracked and insured shipping.
How international orders work
All international orders are shipped on DAP (Delivered At Place) terms. This means:
- The price you pay at checkout covers your goods and international shipping only.
- WatchNation does not collect or charge any overseas sales tax, import VAT, or customs tariffs (duties).
- When your order reaches your country, local customs authorities may apply:
- Import VAT (value-added tax),
- Tariffs or customs duties (import taxes based on product category and value), and
- Handling or clearance fees from the courier.
These charges are set by your country’s customs authority and are payable by you before delivery.
You’ll be contacted directly by DHL with a secure link to pay any applicable charges. Once cleared, your parcel will be released and delivered promptly.
Estimated delivery times (after dispatch)
- European Union: approximately 2–5 working days
- Rest of World: approximately 5–7 working days
Customs processing times vary by country and may extend delivery slightly.
If import charges, tariffs, or duties are not paid
If local charges are unpaid or delivery is refused, the shipment will be returned to us. In this case, we will refund your order minus the outbound shipping cost and any return or customs fees billed to us by the carrier.
Estimating import costs
Import VAT and duty rates vary by country. You can check estimated import taxes and tariffs by contacting your local customs authority or using your government’s online import calculator.
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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.



