NH35 vs NH38: A Look at Seiko’s Most Popular Automatic Movements

When it comes to reliable, affordable, and widely available automatic movements, Seiko’s NH series is often the first choice for microbrands, modders, and enthusiasts alike. Among the most popular are the NH35 and NH38. Both are based on the same architecture, yet they serve slightly different purposes. Let’s explore the differences and why brands might choose one over the other.

A Shared Foundation

The NH35 and NH38 share the same core specifications:

• Beat rate: 21,600 vibrations per hour (3Hz)

• Power reserve: Around 41 hours

• Jewels: 24

• Functions: Hacking seconds and manual winding

• Durability: Shock resistance and proven reliability

This makes both movements equally robust, easy to service, and perfect for everyday watches.

The NH35: With Date Function

The NH35 is the most commonly used Seiko movement in the market today. Its defining feature is the date complication, typically displayed at 3 o’clock but easily customized for different dial layouts.

For brands, the NH35 offers versatility and practicality. For wearers, it provides the added functionality of tracking the calendar—an everyday convenience.

The NH38: No-Date, Clean Design

The NH38 is essentially the no-date version of the NH35. By removing the date wheel, Seiko created a movement that allows for clean, symmetrical dials.

More importantly, the NH38 avoids the so-called “ghost date position.” On some no-date watches using NH35, the crown still clicks into a useless second position meant for the date. With the NH38, this problem is eliminated, resulting in a smoother user experience.

Which One Should You Choose?

• Choose the NH35 if you value practicality, everyday usability, and want the convenience of a date complication.

• Choose the NH38 if you prefer minimalist designs, balanced dials, and dislike unnecessary crown positions.

Both are tried-and-tested workhorse movements, known for their reliability, affordability, and adaptability—qualities that have made Seiko’s NH series a cornerstone of modern watchmaking.

Final Thoughts

Whether you’re a watch enthusiast, a brand owner, or simply curious about what powers your timepiece, the NH35 and NH38 offer two sides of the same coin. One prioritizes functionality, the other prioritizes design purity. Whichever you prefer, you can be confident that both deliver the dependable performance Seiko is known for.