The Seiko 5S21A is a quartz movement introduced in 1988 and now discontinued. It features a smooth sweeping seconds hand—a notable feature for a quartz movement—achieved through an intermittent stepping motor with spiral spring and viscous regulator. The rectangular movement uses an SR920SW battery and was manufactured in Japan.
Last updated 8 Jul 2026Suggest a correction
TECHNICAL SPECIFICATIONS
Movement Type
Quartz
Display Type
Analog
Winding
Quartz (Battery)
FEATURES
Sweep Seconds
QUICK FACTS
FOR WATCH DEALERS
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