HATTORY-SEIKO Y504 Brand HATTORY-SEIKO Caliber Y504 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.401Y504Winding stem03546019840354601