






Seiko Prospex Tuna Tropical Lagoon Black Dial Blue Silicone Strap Men's Watch SNJ039P1
Official UK Authorised Retailer
3 Year Manufacturer Warranty
Free Delivery
Easy Returns
Customer Service & Technical Support
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The Case:
The Prospex ‘Tropical Lagoon’ SNJ039P1 case is designed in the original Seiko ‘Tuna’ style; named by Seiko fans for its case shape resembling a tuna on the wrist. The stainless-steel case measures 47.8mm in diameter and has a height of 13.8mm. The case features a rotating bezel, screw-down crown, and screwed case back making this watch resilient enough to handle recreational diving as well as being a beautiful timepiece to wear to the office.
The Dial:
Bright emerald green and marine blue colours on the minute hand, bezel, and screw-down buttons have inspired the tropical ocean life design behind this watch. Lumibrite has been applied to the hands, indexes and bezel, making this companion timepiece easy to read in the dark.
The Bracelet:
The navy-blue reinforced silicone strap matches the tropical theme of this watch and is the perfect material needed to accompany you on water adventures.
The Functions:
This watch features a water resistance of 200m making this watch perfect for sports in the water and it is also powered by a hybrid solar-automatic calibre movement. This watch also boasts a power reserve of 6 months.
Seiko donates proceeds from Save the Ocean models to the PADI Aware Foundation’s Marine Debris program which is the world’s largest underwater clean-up initiative.
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.

