UNITAS 307BrandUNITASCaliber307Size16 1/2x17 3/4FunctionVersionHands1,15x2,00Stem7921Stem (subs.)Stem (2 pce)Balance staff30214Balance staff (subs.)31211 SSRMainspring (subs.)1,3x14,0x0,17Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8027921723Balance staff, pivoted80231211723Balance staff ST -shock-absorber80230214