




Seiko Prospex Aqua Sumo GMT Green Dial Steel Bracelet Men's Watch SFK003J1
Official UK Authorised Retailer
3 Year Manufacturer Warranty
Free Delivery
Easy Returns
Customer Service & Technical Support
Choose options
Seiko Prospex Aqua King Sumo GMT Green Dial Steel Bracelet Mens Watch SFK003J1
Seiko Prospex introduces its first solar watch with a GMT hand, powered by the in-house built new calibre of 5K65.
The watch shape is affectionately named ‘Sumo’ by Seiko fans because of its size and shape and the 12 o’clock marker – it’s a substantially strong looking timepiece.
The Lumibrite colour on the 24-hour hand is high in visibility underwater and the aqua coloured dial produces vibrant accents to the elegantly pressed pattern design. The 200 metre water resistance is paired with a stainless steel case and high power generation efficiency.
Prospex is a combination of the words ‘Professional’ and ‘Specifications.’ Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike.
Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards.
The Case:
Introducing the Seiko Prospex Aqua King Sumo GMT Green Dial Steel Bracelet Men’s Watch SFK003J1, a timepiece that seamlessly blends style and functionality.
Crafted with a sturdy stainless steel case and bracelet, this watch boasts a robust and durable design that can withstand the toughest of conditions. The 45mm case features a 120-click unidirectional rotating bezel and a scratch-resistant sapphire crystal, ensuring the watch remains protected against scratches and wear and tear. At the 4 o’clock position, the watch features a screw-down crown to ensure proper water resistance.
The Dial:
The green dial features luminescent hour markers and hands, making it easy to read the time in any lighting condition. The date display is located at the 3 o’clock position, while the GMT hand allows for tracking of a second time zone.
The Bracelet:
This model features an oyster styled engineer bracelet made of stainless steel. The brushed links provide durability while the attention to details is on display with the slight touches of polishing on the outsides of the individual links. The bracelet is secured with a push button deployment clasp.
The Functions:
The watch is powered by the Seiko 5K65 movement, which is the brands first solar GMT movement. With a water resistance of up to 200 meters, the Seiko Prospex Aqua King Sumo GMT is suitable for diving and water sports.
The Seiko Prospex Aqua King Sumo GMT Green Dial Steel Bracelet Men’s Watch SFK003J1 is a perfect addition to any watch enthusiast’s collection, with its unique blend of style, durability, and functionality. Whether you’re diving or exploring a new city, this watch will be your perfect companion.
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.
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.

