IWC 430 Brand IWC Caliber 430 Size Function Version Hands Stem 5317 Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8025317471Friction spring f. sweep sec.-pinion