Seiko Prospex Tuna Tropical Lagoon Black Dial Blue Silicone Strap Mens Watch SNJ039P1


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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.

Additional information

Day Display

Day / Date – English & Other

Luminous Material




Free Strap Adjustment

It's important that your watch fits your wrist comfortably and looks great at the same time.

Leather strap watches tend to fit without a problem for most wearers. However, watches fitted with metal bracelets often need adjusting to get the perfect fit.

This is generally a very simple procedure. We can do this for you, or you can get the watch adjusted locally.

Option 1. Specify your wrist measurement and we will adjust it before being sent

When purchasing a watch which has a metal bracelet with adjustable links, we will gladly adjust the watch bracelet to fit your wrist before sending the watch to you - free of charge!

Simply type your wrist measurement (in inches or centimetres) into the bracelet size section of the checkout and we will ensure the watch bracelet is adjusted accordingly before being sent to you. We will include all the surplus links, with the watch.

How to measure your wrist

You can measure your wrist with a piece of string which you can measure against a ruler:

You should allow about half a centimetre (1/4 inch) of slack to prevent it being too tight on your wrist.

In the event of you needing an extra-long wrist bracelet, which requires an extension to the original watch, we must obtain extra links from the manufacturer, and in this event, we will contact you to inform you of any possible delays or applicable charges.

Watches with bracelets adjusted by WatchNation are still eligible under our refund policy.

Option 2. Buy the watch online from WatchNation and have it adjusted locally

If you wish, you can have it adjusted locally by another jeweller or key cutter. However, you will have to cover the cost of this option yourself.

Delivery Information

Selling PriceRoyal Mail 48
(Tracked & Signed)
Royal Mail 24
(Tracked & Signed)
Royal Mail Special Delivery by 1pmRoyal Mail Special Delivery by 9am
£0 to £30£2.95
(Tracked but no signature)
(Tracked but no signature)
£30.01 to £50FREE£2.95
£50.01 to £294.99N/AFREE
£295 or moreN/AFREE

All orders are sent using Royal Mail's tracked delivery service. Orders placed before 4.00 pm (Monday-Friday) or 11.00 am Saturday are dispatched the same day. Sunday orders are dispatched on the following Monday.

We are pleased to offer worldwide shipping. For accurate shipping rates, please add the item to your basket. Once you enter your shipping address, you will be offered all shipping options.

All shipping rates include duties and taxes paid. The total price you see in the checkout, is all you will have to pay.

On average, a delivery to the EU will take between 3-5 working days and delivery to the rest of the world will take 5-7 working days.


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