HATTORY-SEIKO Y978 Brand HATTORY-SEIKO Caliber Y978 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.401Y978Winding stem03517949840351794401Y978Winding stem03517939840351793