HATTORY-SEIKO WWW1 Brand HATTORY-SEIKO Caliber WWW1 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.401WWW1Winding stem03511349840351134401WWW1Winding stem03515469840351546