What Is a Seiko Mod?

A Beginner’s Guide to Custom Seiko Watches

In the world of watches, few brands offer as much modding potential as Seiko. If you've stumbled upon the term “Seiko Mod”, you're likely wondering what it means — and whether it’s right for you. This beginner’s guide covers all the essentials, from what a Seiko Mod is, to why it’s exploded in popularity among collectors and everyday enthusiasts alike.

What Is a Seiko Mod?

A Seiko Mod (short for Seiko modification) is a custom-built watch that uses an original SII movement — like the NH35 or NH36 — paired with upgraded or completely reimagined external components. These include:

Dials
Hands
Cases
Bezels
Crystals
Straps

The result? A unique timepiece that blends Seiko’s mechanical reliability with completely fresh aesthetics — tailored to your taste.

Is Modding Legal? Is It Genuine?

A Seiko Mod is not a counterfeit. It uses real Seiko mechanical movements, but changes the case, dial, and other visual components. It’s like customizing a car: the engine remains authentic, but the look becomes yours.

📌 Important Note:
While modding is legal and very popular in the watch community, modded watches are not officially endorsed by Seiko.

Why Are Seiko Mods So Popular?

Modding-friendly movements – NH35/NH36 are reliable, affordable, and easy to regulate
Limitless creativity – Create a diver, pilot, dress watch or even a GMT from scratch
Affordable personalization – Far cheaper than modifying luxury brands
A passionate global community – Modding Seiko has become a shared hobby among enthusiasts, builders, and designers

At Watchbrick, We Don't Just Mod — We Curate.

At Watchbrick, we take Seiko modding a step further. Instead of offering random combinations, we create curated designs, built in limited batches, and assembled with precision.

We source premium aftermarket components and pair them with regulated Seiko NH movements to ensure the final product is not just unique — it’s reliable, wearable, and ready to be passed down.

Final Thoughts

If you're someone who values both mechanical quality and artistic freedom, a Seiko Mod might be your perfect daily watch.

Whether you're just getting started or you're looking for a serious collector piece, Watchbrick is here to offer custom Seiko mods built with intent — not mass production.