HATTORY-SEIKO 7J21BrandHATTORY-SEIKOCaliber7J21SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.4017J21Winding stem03515839840351583.7J21CONDUCTING PLATE86510069