HATTORY-SEIKO 7812A Exploded diagram BrandHATTORY-SEIKOCaliber7812ASizeFunctionVersionHandsStem354-781Stem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.200Large driving wheell + cannon pinion221-7819840221781