HATTORY-SEIKO WWW4 Brand HATTORY-SEIKO Caliber WWW4 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.401WWW4Winding stem03511559840351155