HATTORY-SEIKO 9721A Exploded diagram BrandHATTORY-SEIKOCaliber9721ASizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.4060BCoil -red4002-01098404002010