LONGINES 520 Brand LONGINES Caliber 520 Size Function Version Hands Stem 4916 Stem (subs.) Stem (2 pce) Balance staff 25006 Balance staff (subs.) Mainspring (subs.) 1.20x7.5x0.08x320 Mainspring (subs.) Ersatz 02871 Battery WatchpartsPart NocaliberdescriptionoriginalArtno.200Center wheel + cannon pinion240Cannon pinion401Winding stem8024916407Clutch wheel410Winding pignon420Crown wheel430Click spring443Setting lever assembled723Balance staff ST -shock-absorber80225006