IWC 412 Brand IWC Caliber 412 Size Function Version Hands Stem 5441 Stem (subs.) Stem (2 pce) Balance staff 14302 (Boley Nr.) Balance staff (subs.) Mainspring (subs.) Spezial Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8025441445BSetting lever spring94200445C412723Balance staff ST -shock-absorber80214302770BMainspring94200770412