HATTORY-SEIKO 7550A Brand HATTORY-SEIKO Caliber 7550A Size Function Version Hands Stem 354-371 Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part 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