AS 1789 Brand AS Caliber 1789 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.205= 1580Center wheel drilled + cannon920002051580227= 1538Sweep second pinion920002271538