Seiko Mod Submariner & GMT Watches

Seiko Submariner and Seiko GMT — Two Icons, One Collection

The Seiko Submariner and Seiko GMT are different watches solving different problems, so we've built them as two distinct lines instead of forcing one dial to do both jobs. The Seikomariner is the diver — rotating bezel, 41mm case, built for the version of you that actually gets in the water. The GMTeiko is the traveller's silhouette — a 3-hand watch styled after the GMT look on the reliable NH35 automatic as standard, with a genuine 4-hand independently-adjustable GMT movement available via the GMT Function option for anyone who actually needs to track a second time zone.

The Submariner Side

Seikomariner runs on the Seiko NH35 automatic with a genuinely functional rotating bezel and 5ATM water resistance. Bracelet options run oyster, jubilee, or both depending on the colourway — Batman, Kermit, and the classic black dials all live here, each hand-assembled with the same attention as the diver they're inspired by. The bezel actually rotates and clicks into place — it's not a fixed ring pretending to be functional.

The GMT Side

GMTeiko runs on the reliable NH35 automatic as standard — a clean 3-hand watch (hour, minute, second) styled after the GMT look. Pepsi and Coke colourways come with a choice of jubilee or oyster bracelet, alongside two-tone, gold, rootbeer, and Bruce Wayne options, which are jubilee only. Want the real thing? Every GMTeiko can be built with a genuine NH34 automatic movement instead — a 4th, independently adjustable GMT hand you set once for home time and adjust freely when you land — by selecting the GMT Function option at checkout.

Why Two Lines Instead of One

A dive watch and a GMT solve different problems — one's about depth rating and a bezel you can time with, the other's about tracking two time zones without carrying a second watch. Cramming both into one dial usually means neither works properly. Keeping them separate means each movement, bezel, and bracelet choice is doing exactly one job well.

Built for 5ATM, Not Just Photos

Both lines carry 5ATM water resistance, sapphire crystal, and 316L stainless steel — enough for swimming, showering, and everyday knocks, not just sitting in a display case. Hand-assembled in Sweden. Whether you want the diver's bezel or the traveller's GMT styling — with the GMT Function available as an upgrade — this is a Seiko mod Submariner and GMT collection built for real use.

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FREQUENTLY ASKED QUESTIONS

What is a Seiko Mod?

A Seiko Mod is a custom-built watch, hand-assembled with a reliable automatic or hybrid Seiko movement. It's paired with premium aftermarket parts to create a watch that's uniquely yours!

Do they come with any kind of warranty?

Yes. All watches ship with a 1-year warranty covering movement-related issues.

I like a watch, but want a different strap/dial.

No problem. Message us before you order - we can customize it for you.

How long does assembly take?

Assembly takes about 7-12 business days. That's because every watch is built entirely to order. We source the parts you've chosen, hand-assemble everything with care, and run a full quality check before it ships. That way you get a custom watch built to last.

Do you ship internationally?

Yes, we ship worldwide. Standard shipping rates apply and are calculated at checkout.