HATTORY-SEIKO Y977BrandHATTORY-SEIKOCaliberY977SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.401Y977Winding stem03517949840351794401Y977Winding stem03517939840351793