The 4R38 is an automatic movement manufactured by Seiko and belongs to the 4R caliber family. It is based on the 4R35 and retains the core specifications of that workhorse: 21600 vph frequency, 24 jewels, and approximately 41 hours of power reserve, with hacking and hand-winding functionality. The movement adds a day complication to the base 4R35's date feature, distinguishing it within the family. It remains in production and is used in Seiko 5 Sports and other entry-level Seiko models.
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Jewel Count
24 jewels
Power Reserve
41h
Frequency
21,600 vph (3 Hz)
Display Type
Analog
COMPLICATIONS
FEATURES
More Seiko movements
QUICK FACTS
BRAND
TYPE
AutomaticSTATUS
In ProductionMANUFACTURE
In-houseBASED ON
Seiko 4R35CALIBER FAMILY
4RALSO KNOWN AS
FOR WATCH DEALERS
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