HATTORY-SEIKO 7J21 Brand HATTORY-SEIKO Caliber 7J21 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.4017J21Winding stem03515839840351583.7J21CONDUCTING PLATE86510069