Mechanical part-  when trying to rewind and set the time, it does not function appropriate and does not wind, so therefore does not work. I currently have moved home and do not have the warranty card, I have purchased this from Groupon and can supply images to confirm the proof of purchase, so this is a genuine purchase, I have emailed in and spoke to a Alison who has advised me to return the watch, but I am weary of returning this watch, without proper confirmation.