UNITAS 309BrandUNITASCaliber309Size16 1/2x17 3/4FunctionVersionHands1,15x2,00Stem12003Stem (subs.)Stem (2 pce)Balance staff42001Balance staff (subs.)Mainspring (subs.)1,9x15,0x0,17Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem80212003723Balance staff ST -shock-absorber80242001