Clasp fell off in only a matter of 3 hours of wearing. After being fully wound the watch failed to keep accurate time by hours, not minutes. After being wound it fails to run even overnight stopping in the middle of the night. How long it runs is hard to say as it doesn’t keep accurate time. 
Instructions on how to open clasp might be handy. Is it hinged at top or bottom? Not wanting to force it we left it alone, it is possible to wind without clasp being opened.