Seiko 4R SeriesManufacturer Seiko Caliber Family 4R Type Mechanical, automatic Lignes 12”’ Diameter 27.4mm Jewels (see below) Vibrations Per Hour 21,600 vph...Automatic 17
Seiko Caliber 4R36Manufacturer Seiko Caliber Number 4R36, 4R36A Movement Type Automatic Diameter 27.4mm (casing 27mm) Thickness 5.32mm Jewels 24 Vibrations Per Hour...Automatic 93171
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