HATTORY-SEIKO 8N91 Brand HATTORY-SEIKO Caliber 8N91 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.4018N91Winding stem03513889840351388