HATTORY-SEIKO YM56BrandHATTORY-SEIKOCaliberYM56SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.401YM56Winding stem03515809840351580