LONGINES 520BrandLONGINESCaliber520SizeFunctionVersionHandsStem4916Stem (subs.)Stem (2 pce)Balance staff25006Balance staff (subs.)Mainspring (subs.)1.20x7.5x0.08x320Mainspring (subs.)Ersatz 02871BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.200Center wheel + cannon pinion240Cannon pinion401Winding stem8024916407Clutch wheel410Winding pignon420Crown wheel430Click spring443Setting lever assembled723Balance staff ST -shock-absorber80225006