Manufacturer Seiko Caliber Family 4R Type Mechanical, automatic Lignes 12”’ Diameter 27.4mm Jewels (see below) Vibrations Per Hour 21,600 vph...
4R36
Manufacturer Seiko Caliber Number 4R36, 4R36A In-House? Yes Movement Type Automatic, self-winding mechanical Diameter 27.4mm Casing Diameter 27mm Thickness 5.32mm...
Manufacturer Seiko Time Corp. Caliber Number 7S26 Replaced By 4R36 Movement Type Automatic, self-winding mechanical In-House? Yes Diameter 27.4mm Casing...
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