HATTORY-SEIKO V721 Brand HATTORY-SEIKO Caliber V721 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.401V721Winding stem03518809840351880401V721Winding stem03518909840351890