Dreaming of a watch that perfectly suits your style? Then building your own Seiko mod is the perfect option. Whether you prefer a classic Datejust look, a rugged diver's watch, or a watch with an Arabic dial—with the right parts and a little patience, you can create a unique masterpiece.
In this beginner-friendly Seiko modding guide, we'll show you step-by-step how to build a custom Seiko watch .
🧩 Step 1: Choose the right watch
Most modders use the Seiko NH35 or NH36 movement .
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NH35 = undated
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NH36 = with day/date
👉 Reliable, affordable and widely available worldwide.
Tip: Always buy an original, not a cheap clone. Websites like CrystalTimes, Namoki, Lucius Atelier , or DLW Watches are reliable suppliers.
🧱 Step 2: Collect the parts
A Seiko mod consists of the following core components:
| Element | Function |
|---|---|
| Cupboard | Shape and appearance of your watch |
| Dial | Determines the visual character |
| Hands | Matching the style of the dial |
| Bezel | Often rotating, with insert |
| Glass | Usually sapphire (flat, domed, double domed) |
| Caseback | Transparent or closed |
| Crown | To adjust time/date |
| Band | Oyster, Jubilee, rubber or leather |
🔧 Step 3: Gather the tools
You will need precision instruments to safely assemble your watch:
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Caseback opener
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Hand press
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Movement holder
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Spring bar tool
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Tweezers (anti-magnetic)
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Magnifying glass
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Blower (dust-free working)
Optional: Timegrapher to measure accuracy.
🛠️ Step 4: Build your Seiko mod
1. Install the clock
Make sure your movement is firmly in the holder.
2. Attach the dial
Carefully click these onto the correct feet of the clockwork.
3. Place hands
Use a hand press and place them exactly at 12:00 – avoid “hand collision”.
4. Place the clock in the case
Check that everything is aligned properly.
5. Install bezel & glass
Use a press to neatly insert the sapphire crystal and bezel insert.
6. Close caseback
Place rubber gasket and tighten well (if necessary with silicone grease for waterproofness).
7. Attach the band
Mount your chosen band or strap — and you're done!
✅ Step 5: Test and adjust
Check:
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Are the hands moving correctly?
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Is the date change correct?
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Is everything dust-free?
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Is the watch running accurately?
If necessary, you can have your watch regulated or tested for water resistance at a watchmaker.
💡 Why build it yourself?
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Personal : You choose every detail
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Educational : You understand the watch to the core
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Affordable : Luxurious look without the premium price
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Unique : No mass production, but craftsmanship
🔚 Ready to build your first Seiko mod?
At [ your webshop name ], you'll find ready-made parts and fully assembled Seiko mods. Prefer to have a custom watch built? We'll take care of it for you.
➡️View our custom collection
➡️ Request a custom mod