JUNGHANS 640 Brand JUNGHANS Caliber 640 Size 10 1/2 Function Version Hands 0,70x1,30 Stem 5420 Stem (subs.) Stem (2 pce) Balance staff 22701 Balance staff (subs.) 24401 INCA Mainspring (subs.) 1,3x9,0x0,10 Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8025420410Winding pignon946004106400723Balance staff, pivoted80224401723Balance staff ST -shock-absorber80222701