HATTORY-SEIKO 8N21 Brand HATTORY-SEIKO Caliber 8N21 Size Function Version Hands Stem Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.4018N21Winding stem035138498403513844018N21Winding stem03513889840351388.8N21MAIN PLATE(PLASTIC)01003879840100387.8N21TRAIN WHEEL BRIDGE01253969840125396.8N21FOURTH WHEEL AND PINION02414369840241436.8N21CENTER MINUTE WHEEL02704369840270436.8N21Hour wheel02714359840271435.8N21Setting lever03833879840383387