I know nothing about this. the hands are very bent and there is not a crystal case. I also think it's missing the back. somehow this thing is still ticking and keeping time but i only let it run for 20 minutesbecause i don't want the hands to get stuck. . this is poetically for replacement parts however I do think it's rare because it is working. I have a video of the inside working also but I can only post 1 video