If you are exploring the world of Seiko mod watches, you have probably heard about the NH35 and NH38 automatic movements. Both are popular, reliable, and widely used in custom Seiko mods — but they are designed for slightly different purposes.
In this guide, we will break down the key differences between the NH35 and NH38 movements, helping you decide which one is best for your next custom watch.
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What Is the NH35 Movement?
The NH35 is one of the most trusted automatic watch movements in the Seiko mod community. Manufactured by Seiko Instruments, it is known for its durability, affordability, and smooth performance.
NH35 Specifications
- Automatic self-winding movement
- 24 jewels
- Approximately 41-hour power reserve
- Hacking feature (second hand stops when setting time)
- Hand-winding capability
- Date function
Because of its reliability and versatility, the NH35 is commonly used in:
- Submariner mods
- GMT-inspired builds
- Dive watch mods
- Everyday luxury-inspired watches
What Is the NH38 Movement?
The NH38 is very similar to the NH35 in terms of performance and reliability. However, the biggest difference is that the NH38 does not include a date wheel.
Instead, it is designed specifically for open-heart or skeleton-style watches where the balance wheel is visible through the dial.
NH38 Specifications
- Automatic self-winding movement
- 24 jewels
- Approximately 41-hour power reserve
- Hacking and hand-winding
- No date function
- Designed for open-heart dials
The NH38 is commonly used in:
- Skeleton watches
- Open-heart luxury mods
- Minimalist dress watch builds
NH35 vs NH38: Main Differences
| Feature | NH35 | NH38 |
|---|---|---|
| Date Function | Yes | No |
| Open-Heart Compatible | Limited | Yes |
| Best For | Dive & daily watches | Skeleton/open-heart watches |
| Reliability | Excellent | Excellent |
| Power Reserve | ~41 Hours | ~41 Hours |
| Hand-Winding | Yes | Yes |
| Hacking Feature | Yes | Yes |
Which Movement Is Better?
Neither movement is objectively “better.” It depends on the style of watch you want.
Choose NH35 If You Want:
- A date display
- A practical daily watch
- A classic dive-watch style
- A versatile build
Choose NH38 If You Want:
- An open-heart design
- A cleaner dial appearance
- A more artistic or luxury aesthetic
- A skeleton-style watch
Why Watch Enthusiasts Love NH35 & NH38
Both movements are popular because they offer:
- Reliable Japanese engineering
- Affordable servicing
- Strong durability
- Smooth automatic performance
- Excellent value for custom watch builds
For many watch enthusiasts, these movements provide the perfect balance between luxury aesthetics and everyday practicality.
The NH35 and NH38 are two of the best automatic movements for custom Seiko mod watches. While the NH35 focuses on practicality with its date function, the NH38 is ideal for open-heart and skeleton designs that showcase the beauty of mechanical watchmaking.
If you prefer a classic everyday watch, the NH35 is an excellent choice. If you want a more modern and visually striking design, the NH38 may be the perfect fit.
At Watches By Cody , both NH35 and NH38 builds are carefully selected to combine reliability, craftsmanship, and luxury-inspired design.
