UNITAS 427 Brand UNITAS Caliber 427 Size 19x21 Function Version Hands 1,15x2,00 Stem 12003 Stem (subs.) Stem (2 pce) Balance staff 52002 INCA Balance staff (subs.) 53001 SSR Mainspring (subs.) 2,5x16,0x0,20 Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem80212003723Balance staff ST -shock-absorber80252002723Balance staff, pivoted80253001