Seiko (SII) NH38A 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, and Hand Windable
- Shock System: Seiko Diashock
Special Note: The NH38A is designed without a date function, making it ideal for clean-dial watch builds or skeleton designs where the date aperture is not needed.