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Wattchys

Seikomariner | GMTeiko Sprite

Seikomariner | GMTeiko Sprite

$329.95 USD
$459.95 USD $329.95 USD
Sale Sold out
Taxes included.
✓ Free tool kitIncluded in the box with every watch
Parts in stock
Assembly in workshop
Delivery

Estimated delivery date: 14 November – 18 November 2026

A dive watch built the way dive watches should be: a unidirectional bezel that clicks with intent, a dial you can read at a glance underwater, and a case that has no interest in being delicate.

This is the GMTeiko Sprite configuration, assembled to order and checked by hand before it ships.

Specification

  • Seiko NH35 automatic movement — 24 jewels, hacking seconds, hand-winding, approx. 41h power reserve
  • Exhibition caseback so you can watch it run
  • 316L stainless steel case and bracelet or strap
  • Sapphire crystal with anti-reflective coating
  • Luminous hands and markers
  • Assembled to order — no two builds sit in a warehouse waiting
  • 1-year Wattchy's warranty, extendable to 2

Good to know

Every Seikomariner is built individually once you order, which is why it takes a few days longer than an off-the-shelf watch and why it arrives set up properly. The Seiko NH35 automatic movement is the same workhorse used across the modding world for one reason: it is serviceable anywhere, by anyone.

Wattchy's is an independent brand. We are not affiliated with, authorised by, or endorsed by any other watch manufacturer.

Inspired by a timeless design and powered by a reliable Seiko NH35 automatic movement, this timepiece is hand-assembled for precision and style.

  • ✔Premium finish without the luxury markup
  • ✔Hand-assembled by skilled watchmakers
  • ✔Free tool adjustment kit included with every order

Description

Built with a 316L stainless steel case for lasting durability and a refined finish.

Sapphire-coated crystal with anti-reflective treatment for scratch resistance and a clear view of the dial.

Water-resistant construction, finished with a comfortable butterfly-style clasp.

Diameter: 41 mm
Thickness: 12 mm
Glass: Sapphire, anti-reflective
Bracelet: Adjustable (14.5 cm – 22 cm)
Movement: Seiko NH35 automatic
Water resistance: Tested and approved

A modern Seiko-based mod — sleek, well-finished, and unmistakably its own.

Components and materials

  • Genuine Seiko automatic movement
  • Sapphire crystal, anti-scratch with anti-reflective coating
  • 316L stainless steel case and hardware

Shipping & Returns

Shipping
Free shipping on every US order. Every piece is hand-assembled to order, so delivery takes 10-14 days from when you place it. We ship internationally too — any customs duties or import fees are on us, not you, so the price you see is the price you pay.

Free with every order
Every Wattchys ships with a tool adjustment kit at no extra cost, so you can size the bracelet to your wrist right out of the box.

Returns
We offer a 30-day return policy on unworn pieces. To start a return, contact our team at info@wattchys.com.

What is an automatic watch?

An automatic watch runs without a battery — the natural motion of your wrist winds the mainspring as you wear it, keeping it powered day to day.

If left unworn for a couple of days, it will simply stop, and starts again as soon as you put it back on or give the crown a few turns.

This mechanical movement, built on traditional watchmaking craftsmanship, is more intricate than a standard battery-powered quartz movement.

Trusted by thousands of happy customers

View full details
1-Year Warranty Water Resistant 30-Day Hassle Free Returns Free US Shipping

Crafted for those who appreciate the difference

Every component is chosen for a reason, not for show. From the sapphire crystal to the precision Seiko movement inside, each detail is built to perform and to last, so the difference is something you feel every time you check the time.

Precision engineering in every detail

Watchy's reengineered components bring together high-precision parts and custom finishes to elevate every second on your wrist.

Quality in Every Detail

SEIKO MOVEMENT

SEIKO MOVEMENT

Automatic, self-winding, 41+ hour power reserve, and trusted in the watch industry for its accuracy.

WATER RESISTANT

WATER RESISTANT

3ATM water-resistant, perfect for daily wear and protected against rain or everyday splashes.

SAPPHIRE CRYSTAL

SAPPHIRE CRYSTAL

Fitted with sapphire crystal, ultra-clear, scratch-resistant. Your watch stays sharp, no matter what.

STAINLESS STEEL

STAINLESS STEEL

Crafted from 316L stainless steel, the same grade used by premium watch brands. Built to shine for a lifetime.

Wear It Risk-Free for 30 Days

Changed your mind? Just send it back and we'll issue a full refund, no explanations needed.

Each Watchy's timepiece is hand-assembled with genuine components and careful attention to detail.

✔ Assembled by trained watch specialists

✔ No shortcuts, no imitation parts

✔ Built to hold up, wear after wear

Don't just take our word for it

Write a review See reviews

James Smith

Best value for the price. If you’re comparing options in this price range, this is the one. You’re basically getting the “expensive watch” feeling without paying for a logo. If you're on the fence about getting this, just go for it! I waited too long to buy it, and now I can't believe how good it looks on my wrist—it feels so much more expensive than it is. Seriously, you won’t regret this purchase!

Robert Johnson

I almost went for a pricier option, but I'm so glad I found this instead! It gives off the same great vibe without breaking the bank, and I honestly couldn't be happier with my choice. Highly recommend it!

William Davis

If you're thinking about this option, just go for it! For under €300, I really don't believe there's anything that competes in terms of finish and overall presence. It genuinely stands out and feels like a steal at this price.

Michael Brown

I recently picked up this watch, and I have to say, it's an incredible find for the price! It gives you that luxe vibe without the hefty price tag, feeling like a high-end piece without the flashy logo. If you're looking for something stylish and well-made without breaking the bank, this is definitely the one to consider!

Mary Jones

I was really impressed with the end product—it was even better than I was expecting! Plus, I received a lovely free gift, and when I had questions, the customer care team responded quickly and kindly. I will definitely be buying from them again!

Jennifer Miller

I've just bought my third watch from this brand, and I couldn't be happier! The value for the price is unbeatable, and it looks fantastic. If you want great results without breaking the bank, this is definitely the way to go!

Linda Wilson

I recently got the Bruce Wayne watch, and I couldn’t be happier with it! It feels heavy and premium, and honestly, it looks just like those high-end models. Plus, my son and I now have matching watches, which makes starting our collection together even more special!

Chloe Willis

I recently picked up my third watch from this brand, and I couldn't be happier! The customer service was fantastic, and the watch itself is just perfect for my style. It's great to find a product that meets my expectations and is backed by such awesome support!

Joshua Godfrey

I recently bought a Wattchy, and I couldn't be happier with my choice! The product is fantastic, and the customer service was top-notch. This is actually my third watch from them, and each time has been a delightful experience!

Josh Grey

I had an amazing experience with my recent purchase! The whole process was smooth and easy, and I felt well-informed every step of the way. The product itself is fantastic—I'm really happy with my decision!

Any last questions?

No? Explore all watches →

Do you offer a warranty?

Every watch includes a warranty covering the movement and assembly. Details are provided at checkout.

How does a Seiko-based mod watch work?

We take a genuine Seiko automatic movement and build a fully custom exterior around it — case, dial, hands and strap — inspired by iconic watch designs.

When will my order arrive?

Most orders leave our workshop within 7 to 10 business days. Shipping is free on every US order, and we ship internationally too — any customs duties are covered by us, not you.

My strap feels loose, what do I do?

Reach out to our support team and we'll help you adjust it or point you to a local jeweler.

Will people know it's not the original brand?

Our watches carry the Seiko name on the dial, since that's the real movement inside. We build homage designs, not counterfeits — and we're upfront about that.