IWC 964 Brand IWC Caliber 964 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.771BMainspring AUT sliding attachemnet942007719641488BPawel winding wheel94201488964