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Seiko 4R34 / NH34 Parts
The 4R34 and the NH34 are automatic movements produced by Seiko Instruments Inc. (SII). They are nearly identical in terms of functionality and technical specifications, with the primary differences stemming from branding, calibration, and target markets. Here's a detailed breakdown:
Similarities
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Mechanical Features:
- Both are automatic movements with manual winding and hacking (the second-hand stops when setting the time).
- Share the same specifications:
- Beats per hour (BPH): 21,600 (6 ticks per second).
- Power reserve: Approximately 41 hours.
- Number of jewels: 24.
- Both feature a GMT complication, allowing tracking of a second time zone with an independently adjustable GMT hand.
- Include a date complication.
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Design and Durability:
- Both are robust, reliable, and well-suited for entry-level GMT watches.
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Functionality:
- GMT hand is set using the crown, making it user-friendly.
- Designed to fit a wide range of cases.
Differences
| Aspect | 4R34 | NH34 |
|---|---|---|
| Branding | Exclusively used in Seiko watches, branded "Seiko". | Unbranded or marked "SII", sold to third-party manufacturers. |
| Purpose | Designed solely for Seiko’s in-house watches. | Distributed to microbrands and independent manufacturers for broader use. |
| Calibration | Pre-calibrated by Seiko, potentially with tighter tolerances. | Typically unregulated; fine-tuning is handled by the manufacturer or watchmaker. |
| Availability | Available only in Seiko watches; not sold as a standalone movement. | Readily available for purchase from aftermarket suppliers. |
| Rotor Decoration | Branded "Seiko" and may include decorative finishes. | Usually unbranded or marked "SII"; customizable by brands. |
| Price | Included in Seiko watches; not available separately. | More affordable and widely available for purchase individually. |
Use Cases
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4R34:
- Exclusively used in Seiko watches like the Seiko 5 Sports GMT series.
- Ensures brand authenticity and quality calibration for Seiko timepieces.
-
NH34:
- Popular among microbrands and independent watchmakers for creating GMT watches.
- A versatile choice for custom and aftermarket designs due to its availability and affordability.
Which One Should You Choose?
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4R34:
- If you are buying or repairing a Seiko GMT watch and want an authentic Seiko part.
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NH34:
- If you are building or modifying a watch, or if you are part of a microbrand looking for a reliable and affordable GMT movement.
Conclusion
The 4R34 and NH34 are functionally identical but differ in branding and market focus. The 4R34 is exclusively for Seiko watches, ensuring brand authenticity and tighter calibration, while the NH34 is widely available and popular for independent watchmakers and microbrands.
