HATTORY-SEIKO 8121BrandHATTORY-SEIKOCaliber8121SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.4018121Winding stem03547659840354765.8121MAIN PLATE(PLASTIC)01017749840101774.8121TRAIN WHEEL BRIDGE01257759840125775.8121CENTER WHEEL AND PINION02217769840221776.8121FOURTH WHEEL AND PINION02417769840241776.8121Hour wheel02717769840271776.8121Setting lever03837559840383755