RONDA 9015-21 Brand RONDA Caliber 9015-21 Size Function Version Hands Stem 7248 Stem (subs.) 7249 Stem (2 pce) Balance staff 31710 Balance staff (subs.) 31711 Mainspring (subs.) Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8027248401Aufzugwelle Ersatz8027249723Balance staff ST -shock-absorber80231710723Balance staff, pivoted80231711