Family: 631x21 jewels
Vintage automatic watch movement with bilingual day-date calendar. Part of the 63 series family with some parts interchangeable with 61 series movements. Often confused with the 6139 chronograph movement.
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Jewel Count
21 jewels
Display Type
Analog
Shock Protection
Diashock
FEATURES
Magic Lever Winding
QUICK FACTS
BRAND
TYPE
AutomaticSTATUS
DiscontinuedMANUFACTURE
In-houseBASED ON
Seiko 6309CALIBER FAMILY
631xCOUNTRY
JapanALSO KNOWN AS
cal. 6319seiko 6319