Seiko (SII) Caliber NH38 Open Heart Mechanical Watch Movement TMI

FUNCTION

• Hours, minutes, central seconds
• Jewel 24 jewels
• 21,600 bph
• Accuracy -20 ~ +40 seconds / day ( 23 ± 2 ºC )
• Manual winding
• Automatic winding with ball bearing
• Both winding with one way clutch (Magic Lever)
• Power reserve 41 hours
• Second hand reset