Seiko NH35 vs NH34 vs NH36 vs NH38 vs NH70 – Which Movement is Right for You?
A detailed comparison of the popular Seiko NH caliber series—NH35, NH34, NH36, NH38, NH70—with specs, strengths, weaknesses, and guidance for custom builds.
Introduction
When building or modifying a Seiko watch, the choice of movement (caliber) is crucial. Seiko’s NH series offers a robust set of options—NH35, NH34, NH36, NH38, NH70—each with features and trade-offs. In this guide, we compare these calibers side by side and help you pick the right one for your build.
Specs Comparison
| Caliber | Functions | Hand Stack / Pinions | Hacking & Winding | Power Reserve | Typical Use Case |
|---|---|---|---|---|---|
| NH35 | Date only | Hour 1.50 mm, Min 0.90 mm, Sec 0.25 mm | Yes / Yes | ~41 hours | Standard diver / robust workhorse |
| NH36 | Day + Date | Same as NH35 | Yes / Yes | ~41 hours | Field / dress builds needing day display |
| NH34 | GMT (24h + date) | Hour 1.30 mm, Min 0.90 mm, GMT 1.00 mm, Sec 0.25 mm | Yes / Yes | ~41 hours | GMT builds / travel watches |
| NH38 | No date (time only) | Same as NH35 | Yes / Yes | ~41 hours | Minimalist builds without date window |
| NH70 | No date (time only, upgraded spec) | Same as NH35 | Yes / Yes | ~41 hours | Higher-spec minimal builds, better finishing |
See the Movements in Action
Watch this video review comparing Seiko NH35 and NH36 movements, showcasing their functions and reliability:
Detailed Comparisons & Trade-offs
- NH35 vs NH36: Difference is the day function. NH36 adds day; NH35 is simpler.
- NH34: Adds GMT (dual time), requires compatible dials and cases.
- NH38 / NH70: Both no-date variants; NH70 has higher-grade finishing.
Which Movement Suits Your Build?
- Classic diver: NH35
- Day display: NH36
- Travel/GMT build: NH34
- Minimalist look: NH38 or NH70
Conclusion
Each Seiko NH movement has its role. NH35 is a dependable workhorse, NH36 adds day display, NH34 is perfect for GMT, and NH38/NH70 suit minimalist builds. Pick based on your design vision and test compatibility before assembly.
Need Help Picking the Right Movement?
At Rexx Timepieces, we assist with movement selection, calibration, and full custom builds.