HATTORY-SEIKO 7550ABrandHATTORY-SEIKOCaliber7550ASizeFunctionVersionHandsStem354-371Stem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.4017550Winding stem03546029840354602.7550MAIN PLATE(PLASTIC)01017519840101751.7550CENTER WHEEL BRIDGE01227509840122750.7550CENTER WHEEL AND PINION02217509840221750.7550Cannon pinion02256039840225603.7550FOURTH WHEEL AND PINION02417549840241754.7550Hour wheel02716039840271603.7550Setting lever03836019840383601.7550BACK PLATE86139971