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 Movement Type Automatic Diameter 27.4mm (casing 27mm) Thickness 5.32mm Jewels 24 Vibrations Per Hour...
Manufacturer Seiko Caliber Number 7S26 Replaced By 4R36 Movement Type Automatic Diameter 27.4mm Casing Diameter 27mm Height 4.8mm thick Jewels...
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