Family: 4R
The Seiko Instruments Inc. 4R38 is an automatic movement with no date complication. It operates at 21,600 bph with a power reserve of approximately 41 hours. The 12''' (27mm) diameter caliber belongs to Seiko's in-house 4R family. The movement remains in production and is used in various Seiko sports and dress watches.
Last updated 29 Apr 2026Suggest a correction
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Display Type
Analog
FEATURES
Hacking SecondsHand Winding
QUICK FACTS
FOR WATCH DEALERS
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