TABLE OF CONTENTS
Overview
The NH34A is an automatic mechanical movement from Seiko, renowned for its robustness and affordability. Featuring a 24-hour GMT complication, it allows wearers to track a second time zone, making it a practical choice for travelers and enthusiasts alike.
It operates with a 21,600 vibrations per hour beat rate and offers hacking and hand-winding capabilities. Its durability, ease of maintenance, and compatibility with various watch designs make it a favored option among watchmakers seeking a dependable GMT movement.
Specifications
- Type: Automatic (Self-winding) with Manual Winding Capability
- Functions: Hours, minutes and seconds in the center. 2nd time zone display / 24 h GMT in the center. Date window with quick setting.
- Power Reserve: 41h
- Accuracy: -20 to +40 seconds per day
- Jewels: 24
- Vibrations per Hour (BPH): 21,600 A/h
- Hacking Function: Yes (seconds hand stops when setting the time)
- Hand-Winding: Yes
- Diameter: 27.40 mm
- Thickness: 5.32mm
Crown Position: 3 o’clock
Date Function: Quick-set date at 3 o’clock (optional)
Day Function: No
Time Setting
- Unscrewed crown base position
- Date setting (if present) / GMT hand setting
- Time setting
This movement is used in the following references
U1-GMT
U1-SPG
U4-GMT
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