NH72A Movement
The Seiko NH72A is a popular skeletonized automatic watch movement manufactured by Seiko Instruments (SII/TMI).
- Technical Specifications
- Caliber: NH72A (interchangeable with NH72)
- Type: Mechanical Automatic (Open-worked/Skeleton)
- Diameter: 27.4 mm (12 Ligne)
- Height: 5.32 mm (without cannon pinion)
- Jewels: 24
- Frequency: 21,600 bph (6 Hz)
- Power Reserve: ~41 hours
- Accuracy: -20 to +40 seconds per day
- Features: Hacking (seconds stop when setting time),
- manual hand-winding, ruthenium-grey finish.

























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