B.F.G. 20BrandB.F.G.Caliber20Size13FunctionVersionHands1,10x1,90Stem8904Stem (subs.)Stem (2 pce)Balance staff48603Balance staff (subs.)46505 / 44201Mainspring (subs.)1,6x15,0x0,17Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8028904723Balance staff, pivoted80246505723Balance staff ST -shock-absorber80248603