HATTORY-SEIKO 8M51BrandHATTORY-SEIKOCaliber8M51SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.4018M51Winding stem03511489840351148.8M51MAIN PLATE(PLASTIC)01000869840100086.8M51TRAIN WHEEL BRIDGE01251869840125186.8M51CENTER WHEEL AND PINION02210429840221042.8M51FOURTH WHEEL AND PINION02411019840241101.8M51Hour wheel02711939840271193