Seiko (SII) NH39A Automatic Movement
- Reference Number: NH38A
- Vibrations per hour: 21,600 beats
- Power Reserve: 41 hours
- Jewels: 24
- Diameter: 27.40mm
- Rotor Direction: Bi-directional winding
- Functions: Hacking, Hours, Minutes, Central Seconds, Hand Windable, and 24-Hour Subdial
- Shock System: Seiko Diashock
Special Note: The NH39A features an integrated 24-hour subdial positioned at 10 o’clock, making it a popular choice for watch designs requiring dual-time or 24-hour indication without a date complication.