HATTORY-SEIKO 3M21BrandHATTORY-SEIKOCaliber3M21SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.4013M21Winding stem03515509840351550.3M21MAIN PLATE(PLASTIC)01005519840100551.3M21TRAIN WHEEL BRIDGE01255509840125550.3M21CENTER WHEEL AND PINION02218929840221892.3M21FOURTH WHEEL AND PINION02418929840241892.3M21Hour wheel02715569840271556.3M21Setting lever03835519840383551