Seiko Caliber 4R34Manufacturer Seiko Caliber Number 4R34, 4R34A Movement Type Automatic Diameter 27.4mm (casing 27mm) Jewels 24 Vibrations Per Hour 21,600 bph...Automatic 824
Seiko Instruments (SII) Caliber NH34Manufacturer Seiko Instruments (SII), Time Module Caliber Number NH34, NH34A Movement Type Automatic Lignes 12”’ Diameter 27.4mm (29.36mm w/ spacer)...Automatic 1723
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