Seiko(SII) NH34 GMT Automatic Movement
Aug 14, 2025
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Seiko NH34 Automatic GMT Movement Overview
1. Product Overview
The Seiko NH34, also known as the NH34A or 4R34, is an entry-level automatic mechanical movement with a GMT function from Seiko (manufactured by its subsidiaries TMI/SII). This movement has garnered widespread attention from both the industry and enthusiasts for its reliability, performance, and excellent value.
2. Technical Specifications
Function Layout: Hours, minutes, seconds + GMT (24-hour hand for a second time zone) + date display
Frequency: 21,600 vibrations per hour (vph or vbh)
Number of Jewels: 24 jewels
Power Reserve: Approximately 41 hours
Accuracy: Factory-adjusted to -20 to +40 seconds per day
Diameter: 27.40 mm (29.36 mm including retaining ring)
Height: Approximately 5.32 mm
3. Key Features
The second time zone (GMT) hand allows the wearer to easily keep track of two time zones – extremely practical whether traveling or on business.
The NH34 is nearly identical in size to the popular NH35, making it a direct replacement for the GMT version. However, please note: the GMT handle is taller, requiring a wider center dial aperture, possibly a double-domed crystal, or increased space for existing cases.
Easy adjustment, providing practicality and convenient time setting.
A Cost-Effective Choice
Among movements with a GMT function, the NH34 is currently one of the most competitive options, significantly lower than the cost of Swiss GMT modules, making it a popular choice among microbrands and the MOD community.
4. Recommended Application Scenarios
Official Brand Description: Suitable for those who emphasize "everyday practicality and global time zone compatibility."
NH34 is an excellent basic movement for modification, requiring only minor modifications to achieve GMT functionality.
The brand's product line focuses on cost-effectiveness: providing high functionality while maintaining cost control, it is an ideal choice for creating entry-level GMT watches.