The 4R38 is an open-heart automatic movement with exposed balance wheel at 9 o'clock and date display. The Seiko-branded version of NH38A. Popular in Seiko Presage open-heart models for its display of the beating heart of the movement.
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
In-houseLAUNCH YEAR
2011CALIBER FAMILY
4RCOUNTRY
JapanALSO KNOWN AS
