The NH39A is an open-heart movement with 24-hour subdial, no date. Features exposed balance wheel cutout for visual appeal. The TMI version of Seiko's 4R39. Popular for open-heart designs that want AM/PM indication.
Movement Type
Automatic
Jewel Count
24 jewels
Power Reserve
41h
Frequency
21,600 vph (6 Hz)
Diameter
27.4mm
Height
5.32mm
Display Type
Analog
Rotor Type
bidirectional
Winding
Magic Lever
Shock Protection
Diashock
BRAND
SeikoTYPE
AutomaticSTATUS
In ProductionMANUFACTURE
ÉbaucheLAUNCH YEAR
2011CALIBER FAMILY
NHCOUNTRY
JapanALSO KNOWN AS
