B.F.G. 921BrandB.F.G.Caliber921Size9 3/4FunctionVersionHandsStem6216Stem (subs.)Stem (2 pce)Balance staff33310Balance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8026216723Balance staff ST -shock-absorber80233310