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Seiko

Seiko Prospex Seascape ‘SUMO’ Solar GMT Diver

SFK003J1

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Product Description

Seiko Prospex introduces its first solar watch with a GMT hand, powered by the in-house built new calibre of 5K62.

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 green ‘seascape’ 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.

Model Specifications SFK003J1:

  • This watch exhibits a green dial with luminous dot and baton indices and silver luminous hour, minute and second hands. 
  • The dial also features a date aperture and a bold orange GMT hand. 
  • Sapphire glass protects the dial. 
  • A stainless steel case and a green bezel frame the dial. The case measures 45mm in diameter. 
  • This watch is secured using a stainless steel bracelet. 
  • The timepiece is powered by a quartz solar movement. 
  • This watch is water resistant up to 200 metres (20 bar). 
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Product Specifications
Gift For / Occasion
Valentine's Day
Gender
Men's Watches
Movement & Power
Solar Powered Quartz
Movement Calibre
5K65
Collections
Dive Watches, Luxury Watches
Clearance
Sale Items
Features
GMT Dual Time, Sapphire Glass, Glowing Markers, Glowing Hands, Date Display
Strap Material
Stainless Steel
Case Material
Stainless Steel
Case Shape
Circle
Display Type
Analog
Dial Colour
Green
Strap Colour
Silver
Case Width
45 mm
Case Depth
13.16 mm
Hour Markers
Dots
Water Resistance
200 metres
Condition
New
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

In addition to our 30 day returns policy, all items purchased from 1st October 2026 can now be returned until 15th January 2027, terms apply.

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 from £500 to £2,500, 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), or contact us and we can arrange a collection. For orders over £2,500, please contact us and we will arrange the return for you. 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 (4)
Authorised Retailer
First Class Watches CAN are Seiko 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 Seiko guarantee
    fully stamped (where appropriate)
  • Instruction manual
    Please note some brands use online manuals
  • Official Packaging
    Official Seiko 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.
4
Customer Reviews
5 / 5
Average Rating
5 star (Best) (4)
4 star (0)
3 star (0)
2 star (0)
1 star (Worst) (0)
5 Quality
5 Value
5 Ease of use
5 Style
5
Overall Rating
Customer picture of Seiko Prospex Seascape ‘SUMO’ Solar GMT Diver SFK003J1 Great price on an easy to use and surf website. Fast delivery too.
Watch arrived on time in perfect condition.
What a lovely watch it is too and looks even better in the flesh.
The free bracelet resizing is a great bonus.
I highly recommend this retailer if you are in the market for a new watch.

reviewed 16/02/2025

VERIFIED FIRST CLASS CUSTOMER
5 Quality
5 Value
5 Ease of use
5 Style
5
Overall Rating
Great company, returning customer.

reviewed 20/01/2025

VERIFIED FIRST CLASS CUSTOMER
5 Quality
5 Value
5 Ease of use
5 Style
5
Overall Rating
Fantastic service at an unbeatable price.

Amazing value watch, does everything I want and in my opinion looks as smart as some watches at more than 10x the price, very pleased with the purchase.

reviewed 15/12/2024

VERIFIED FIRST CLASS CUSTOMER
5 Quality
5 Value
5 Ease of use
5 Style
5
Overall Rating
Customer picture of Seiko Prospex Seascape ‘SUMO’ Solar GMT Diver SFK003J1 This Seiko sumo gmt is my candidate for a single watch, watch collection. You have the robustness of a 200m dive watch, with the versatility of a gmt complication, with adjustable local hour hand.
Seiko's lume is legendary, and with the solar powered movement, it's a set and forget watch.
The only thing that lets it down is the bracelet. With drilled lugs, however, it's easy enough to swap it for another strap, which was always my intention, so I wasn't bothered by this.
Price wise, it's not cheap, but you are getting a high quality timepiece and I thoroughly recommend it.

reviewed 22/02/2023

VERIFIED FIRST CLASS CUSTOMER
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