Manufacturer Seiko Caliber Number 6R20, 6R20A Movement Type Automatic, self-winding mechanical In-House? Yes Diameter 27.40mm (outside), 27mm (casing) Height 6.15mm...
Seiko 6R Series
Manufacturer Seiko (Seiko Watch Corporation) Caliber Number 6R64, 6R64A Movement Type Automatic In-House? Yes Jewels 29 Beat Rate 28,800 vph...
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