OMEGA 1151 Exploded diagram BrandOMEGACaliber1151SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.721= 7751Balance cplt. -regulated920007217750