LONGINES 13.31BrandLONGINESCaliber13.31SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)2,00x11,50x0,13Mainspring (subs.)SpezialBatteryWatchpartsPart NocaliberdescriptionoriginalArtno.770BMainspring t-hook954007701331