B.F.G. 427BrandB.F.G.Caliber427SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.8180Fly-back lever -zero actoon92008180427