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Seikomariner Black - image 1
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SEIKOMARINER BLACK

40mm (excluding the crown)Seiko NH35 Automaticsapphire
In stock
£269
£269
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Pay in 3 interest-free payments of £89.66
Afterpay
Pay in 3 interest-free payments of £89.66
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Bracelet on your watch: Oyster

Add a spare bracelet (optional)Pick your FREE extra strap (Buy any 2)

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2-year warranty
28-day returns
Timed & tested

Delivered to your city in 5–8 working days from order (Mon–Fri)

FREE watch box + tool kit with every watch (worth £49)
Product Description

Seiko Mod "Black Yacht-Master"

Honoring the iconic Black Yacht-Master model, this sporty diver-inspired watch pairs a rotating bezel with a comfortable rubber strap for everyday wear.

Key Features:

  • Case Diameter: 40mm (excluding the crown)
  • Case Thickness: 12mm
  • Case Material: 904L Stainless Steel
  • Bezel: Ceramic
  • Dial: Black dial with luminous silver hands and indicators
  • Movement: Seiko NH35 Automatic
  • Crystal: Scratch-resistant sapphire
  • Water Resistance: 3 ATM
  • Bracelet: Rubber strap with folding security clasp

Featuring a professionally restored authentic Seiko movement, known for its exceptional dependability, each watch is upgraded with new aftermarket elements including the bracelet, bezel, sapphire crystal, crown, and clasp. As the movement is refurbished, the overall condition is marked as pre-owned.

Shipping & Delivery

Made to order. At your door in 5–8 working days.

Every watch is hand-assembled to order and delivered within 5–8 working days of ordering. Working days are Monday to Friday, so weekends and bank holidays aren’t counted. You'll get a tracking link by email as soon as it ships.

  • Checked before it ships — every watch is tested so it works properly the moment it's on your wrist.
  • Free tracked shipping — straight to your door, with tracking sent as soon as it's on its way.
Customer Offers
  • Black Friday: buy any 2 watches and save £100, plus a free extra strap on selected watches (pick it above)
  • Free leather watch box and tool kit with every watch
  • Spare bracelets and straps available from £39
  • 2 Year warranty included
  • Free tracked shipping on all orders
  • 24/7 WhatsApp support
  • Klarna 0% available — pay later at no extra cost
  • Got questions? Message us on WhatsApp: https://wa.me/447775430741

Everything in the box

Watch box and tool kit worth £49, free with every watch.

SEIKOMARINER BLACK
Your watch
Watch box
Watch boxFree
Link removal tool kit
Link removal tool kitFree

Key specs

Every number up front, so you know exactly what's on your wrist.

Case diameter
40mm (excluding the crown)
Case thickness
12mm
Case material
904L Stainless Steel
Bezel
Ceramic
Movement
Seiko NH35 Automatic
Water resistance
3 ATM (splash-proof)
Crystal
Scratch-resistant sapphire
Bracelet
Rubber strap with folding security clasp
Warranty
2 years

Customer Reviews

Overall rating: 4.9 / 5 from 351 reviews.

Customer photo review of SEIKOJUST WIMBLEDON - TWO TONE

Fantastic looking but more import, very solid feel and well built. Already looking at others.... 😃

SEIKOJUST WIMBLEDON - TWO TONE

Customer photo review of ROYAL SEIKOAK CHRONO BLACK

Great quality and was delivered exactly on time and will definitely be getting another!

ROYAL SEIKOAK CHRONO BLACK

Customer photo review of SEITONA CHOCOLATE

Quite lightweight - strap clasp feels thin / cheap - seiko branding on face very faint - looks good at a glance & works fine

SEITONA CHOCOLATE

Customer photo review of Watch box + Tool Kit

So far so good , really helpful when I needed help setting watch .

Watch box + Tool Kit

Customer photo review of SEIKOMASTER JAMES BOND Updated Dial

Order was delivered within about 10 days. I couldn’t be happier with the item. Fantastic piece. Thank you.

SEIKOMASTER JAMES BOND Updated Dial

Customer photo review of Watch box

Arrived quickly, as described - good seller :)

Watch box

Customer photo review of SEIKOMASTER JAMES BOND Updated Dial

Very happy with the watch. Having owned an Omega Seamaster before, this is the exact same size and weight. Quality is 10/10 and keep good time. Great watch for the price A++

SEIKOMASTER JAMES BOND Updated Dial

Customer photo review of SEIKOMASTER JAMES BOND Updated Dial

I did take a while to come , but it was well worth the wait . It's a great looking watch and it feels premium . Looking forward to my next purchase .

SEIKOMASTER JAMES BOND Updated Dial

Customer photo review of SEITONA GULF ETD

Easy to order and delivery updates were good. Very pleased with the watch as well.

SEITONA GULF ETD

Customer photo review of SEITONA GULF ETD

Delivery was swift. Packaged well. Out of the box and the watch looked stunning. It has had plenty of admiring looks and comments. I 'modded the mod' by asking for an oyster bracelet rather than a NATO strap and this was no bother and I am glad I did. The weight is substantial and is very well made.

SEITONA GULF ETD

Customer photo review of SEITONA GULF ETD

Love the design and colours of this seiko watch, which will be added to my collection of watches, When I first saw this watch advertised I said to myself that’s for me and by golly it’s fantastic.

SEITONA GULF ETD

Customer photo review of SEITONA ICE BLUE DARK

Excellent service and delivery, plus the excellent Watch

SEITONA ICE BLUE DARK

Customer photo review of Watch box + Tool Kit

Wasn’t quite sure what to expect, but quick delivery, excellent packaging. Watch felt heavy and well made. Didn’t realise one of the knobs was a fake, but at that price, not too bothered. Will be purchasing again. No complaints.

Watch box + Tool Kit

Customer photo review of GMTEIKO PEPSI

Perfect ,just perfect half blue half red if you know you know anyone who was born in Liverpool will understand exactly what l mean classy watch for a classy city

GMTEIKO PEPSI

Customer photo review of SEIKOMASTER JAMES BOND Updated Dial

Yeah I ordered the seikomaster 41mm James Bond with mesh bracelet and updated dial. I had been wanting one for so long to add to my collection and now at long last I have it. It's a beautiful piece and I'm very happy to have it. My collection includes original Omega, Longines and Tudor pieces, amongst many others. This is my first purchase of a seiko mod and it certainly won't be my last. I look forward to my next purchase and maybe even a small discount as a returning customer. Thank you D McWilliams

SEIKOMASTER JAMES BOND Updated Dial

Customer photo review of Watch box

Really happy with my mod. Lovely item

Watch box

Customer photo review of SEIKOMASTER JAMES BOND Updated Dial

Really pleased with the Seiko Mod No time to Die, transfered mine on to a NTD NATO strap and it’s just the perfect combo. It has great weight and feel. Yes different to the £9.5k titanium Omega that it takes its design quest from. But this is absolutely perfect for what I want from a Mod watch. Could not be happier and would definitely consider further purchases. Already have my eyes on the Daytona and Speedmaster styles!

SEIKOMASTER JAMES BOND Updated Dial

Customer photo review of SEITONA GULF ETD

Very impressed. Watch in person is very smart. 5/5 from me.

SEITONA GULF ETD

Customer photo review of GMTEIKO BRUCE WAYNE

My 3rd watch from these guys now and all are outstanding. Again fantastic communication throughout whole process. Highly Recommend 👌🏽👍🏼👏🏽

GMTEIKO BRUCE WAYNE

Customer photo review of SANTEIKO WHITE

30/07/2026 Absolutely love my watch, Great communication throught from Adam. Have another 2 on way and will for sure buying more. Great products, Great Customer service 👍🏼 👌🏽

SANTEIKO WHITE

Customer photo review of SPEEDSEIKO BLACK

Just like my other 2 purchases, this watch is brilliant quality. Hardest part of dealing with these guys is working out what you want next 🤷😳

SPEEDSEIKO BLACK

Customer photo review of GMTEIKO BRUCE WAYNE

My 3rd watch from these guys now and all are outstanding. Again fantastic communication throughout whole process. Highly Recommend 👌🏽👍🏼👏🏽

GMTEIKO BRUCE WAYNE

Customer photo review of SEIKOJUST WIMBLEDON

Absolutely love my watch, Great communication throught from Adam. Have another 2 on way and will for sure buying more. Great products, Great Customer service 👍🏼 👌🏽

SEIKOJUST WIMBLEDON

Customer photo review of ROYAL SEIKOAK CHRONO BLUE

Very good quality nice looking watch took 5 weeks to arrive due to problems getting parts but worth the wait looks exactly like a real AP from a distance.👍🏼

ROYAL SEIKOAK CHRONO BLUE

Customer photo review of SANTEIKO WHITE

Excellent quality watch. Nice weight and sits nicely on my wrist. Also shipping was quicker than I expected.

SANTEIKO WHITE

Customer photo review of SEIKOMARINER

Watch looks great only gripe is it took nearly 4weeks for delivery

SEIKOMARINER

Customer photo review of SEIKOMARINER GOLD - BLACK

Took longer to arrive than I was initially informed. But it’s here now and so far very pleased…

SEIKOMARINER GOLD - BLACK

Customer photo review of SEIKOMASTER JAMES BOND

You won't regret it, such a nice seiko mod watch, great quality, nice weight to it and I love the strap too. All in all... I am very happy.....now, which one should I get next 🤔

SEIKOMASTER JAMES BOND

Customer photo review of SEIKOJUST CHAMPAGNE

Seems like I have waited for ages for this watch but definitely worth the wait… it’s beautiful

SEIKOJUST CHAMPAGNE

Customer photo review of Clearance GMTEIKO PEPSI No Logo GRADE A

Very happy with my purchase. Didn’t know what to expect. But all the GMT functions work properly. Weight is very good even compared to my genuine top end watches. This is worth every penny. Would recommend

Clearance GMTEIKO PEPSI No Logo GRADE A

Customer photo review of SEIKOJUST WIMBLEDON

Very impressed. Catches the light very well even in dark lighting. Cyclops is amazing with the zoom. Had watches in the past where the numbers in the window looked horrendous. This is 10/10 would definitely recommend

SEIKOJUST WIMBLEDON

Customer photo review of SEIKOMASTER JAMES BOND

Finally my watch came today and I am inpressed with the quality of the watch, nice weight and very good on the eye. Nice watch for the price. Build quality is very good. Thanks.

SEIKOMASTER JAMES BOND

Seikomariner Black - image 2
Why it's worth it

The icon look. Built to wear every day.

  • 100% Seiko engine. A genuine Japanese movement, proven over decades.
  • Premium materials. 904L steel case and scratch-resistant sapphire crystal.
  • Checked before it ships. Every watch is timed and tested for fit and finish.
  • Risk-free. 2-year warranty and 28-day returns.

Why pay more?

The same look and feel, for a fraction of the price.

FeatureOn TimeThe icon it's inspired by
Price£269.00£8,000+
MovementGenuine SeikoSwiss in-house
CrystalSapphireSapphire
AvailabilityMade to order, at your door in 5–8 working daysWaiting lists common
Returns28 days, no questionsVaries by retailer
Wear it worry-freeYes, every dayToo precious to risk

Frequently asked questions

What Is It?

A Seiko Mod is a custom built watch that uses a Seiko movement most commonly the NH35, NH36, or NH34 combined with aftermarket/custom components.

Typically, the builder changes parts such as:

  • Dial custom design
  • Hands different style/finish
  • Case often inspired by luxury watch designs
  • Bezel
  • Bracelet/strap
  • Crystal often sapphire
  • Movement genuine Seiko NH-series automatic movement

The important distinction

A Seiko Mod isn't a watch made by Seiko. The movement may be genuine Seiko/NH-series, while the rest of the watch is assembled from third party components.

For example, a watch could contain a genuine Seiko NH35 automatic movement, but have a third-party case, dial, hands, bracelet and crystal.

That's essentially what makes it a "mod": you're modifying/customising the watch rather than buying a complete factory Seiko model.

In simple terms:

Seiko Mod = Seiko automatic movement + aftermarket/custom watch components, assembled into a customised watch.

Is It Genuine?

Yes, Seiko sells their movements to third parties, independent watchmakers, and microbrands. We Pair this with aftermarket parts inspired by iconic models.

What If I don't like the watch?

Simply request a return using the email provided at the bottom of your email invoice.

Please note: Return postage costs are not covered by us and are the customer’s responsibility. Returns must be requested within 28 days of delivery.

Where are your products manufactured?

Where Are Your Watches Manufactured?

Our watch components are sourced from Japan and assembled by watchmakers in both the UK and Taiwan.

Because Japan and Taiwan are geographically close, we’re able to maintain an efficient supply and production process, allowing components to move quickly between suppliers and our assembly partners.

We use a hybrid production model our UK watchmakers handle orders where possible, while our trusted Taiwan based team helps with additional production during periods of high demand.

This allows us to maintain consistent quality while getting your watch to your door within 5–8 working days of ordering (Monday to Friday, excluding weekends).

How long will it take to arrive?

Every watch is made to order and arrives within 5–8 working days of ordering. Working days are Monday to Friday, so weekends and bank holidays aren’t counted. You'll get a tracking link by email as soon as it ships.

Is it waterproof?

Our watches are rated 3 ATM: fine for splashes and rain, but not for swimming or showering.

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