HATTORY-SEIKO 6870 Brand HATTORY-SEIKO Caliber 6870 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.4016870Winding stem035137098403513704016870Winding stem03513759840351375