OMEGA 687 Brand OMEGA Caliber 687 Size Function Version Hands 0,50x1,10 Stem 5020 Stem (subs.) 5047 Stem (2 pce) Balance staff 21801 Balance staff (subs.) Mainspring (subs.) eigen Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8025020401Aufzugwelle Ersatz8025047723Balance staff ST -shock-absorber80221801