Manufacturer Seiko Caliber Number 6R55, 6R55A Movement Type Automatic, self-winding mechanical In-House? Yes Diameter (needs confirmed) Casing Diameter (needs confirmed)...
King Seiko
Manufacturer Seiko Caliber Number 6R31, 6R31A Movement Type Automatic Diameter 27.40mm (needs confirmed) Casing Diameter 27mm (needs confirmed) Height 5.25mm...
Brand Seiko Caliber Number 5740C Base Caliber 5740 Movement Type Manual wind, mechanical Jewels 23 Vibrations Per Hour 36,000 bph...
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