HATTORY-SEIKO YM56 Brand HATTORY-SEIKO Caliber YM56 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.401YM56Winding stem03515809840351580