NH35 vs NH38: A Look at Two of Seiko's Most Popular Automatic Movements
When it comes to reliable, affordable automatic watch movements, few names carry the same reputation as Seiko’s NH series. Among them, the NH35 and NH38 movements are particularly well-known in the world of microbrands, modding communities, and enthusiast-level timepieces. Today we’ll explore the features, similarities, and differences between these two movements - and what makes them ideal choices for a wide range of watches.
Produced by Seiko Instruments Inc. (SII), the NH series is based on the well-established 4R movement architecture. Known for durability and consistency, these movements are often chosen by independent brands seeking a dependable Japanese-made mechanical heart for their watches.
The NH35 is arguably the most ubiquitous Seiko automatic movement on the market. Based on the 4R35, it offers:
Hacking & Hand-Winding: Both features are present, allowing for precise time setting and convenience.
Date Function: Positioned typically at 3 o’clock, the NH35 includes a quick-set date complication.
24 Jewels: Reduces friction and enhances longevity.
Power Reserve: Approximately 41 hours.
Accuracy: Claimed range of -20 to +40 seconds per day (though many examples perform better).
Beats Per Hour: 21,600 bph (6 beats per second).
It’s often found in both dive and field watches where functionality and value are key.
The NH38 shares much of the same architecture and specifications as the NH35 but omits the date complication. This seemingly small change offers distinct advantages:
No 'Ghost Position': Many watches using a date-equipped movement without displaying the date suffer from a “ghost” crown position. The NH38 eliminates this.
Clean Dial Designs: Ideal for symmetrical, no-date dials.
Same Reliability: Like the NH35, it features hacking, hand-winding, 24 jewels, 21,600 bph, and a 41-hour power reserve.
This movement is perfect for brands and enthusiasts who prefer a more balanced aesthetic without the complexity of a date function. We use the NH38 movement in the latest versions of the Geckota Pioneer.
Cost-Effective: These movements are affordable, making them ideal for microbrands and modders.
Reliable: Proven over time with millions of units in circulation.
Easy to Source & Service: Widespread availability of parts and watchmaker familiarity.
Versatile: Suitable for a range of styles, from divers and pilots to minimalist dress watches.
Whether you’re a collector, a watch modder, or simply someone exploring the world of mechanical timepieces, understanding the difference between the NH35 and NH38 can help you make more informed choices. The NH35 is a tried-and-true workhorse with date functionality, while the NH38 offers a cleaner, date-free alternative with the same mechanical reliability.
Both embody the qualities that make Seiko movements respected around the world: practicality, performance, and peace of mind.
