Yes,it's a system 51,did not drop,knock or fell hard.most times riding motorbike.look thru the case back.rotor & winder all works fine.a few times it stop although the watch is half wound.will try to see if SC can offer anything better than the original parts of system 51.if price wise is too expensive to repair like buying a new watch,prefer to change the calibre cos fond of the dial face color