I understand your frustration with receiving the wrong watch. Did you get QC pics. If you are not completely disappointed with the watch, keep it. Trying to send it back could be a pain. You could also wear it for a few days and if you decide you don't like it, you can sell it here.
I would contact Mark about the watch. Even if you plan on keeping the watch, he needs to know a mistake was made. I have read a few threads lately about people receiving the wrong watch or a watch with clear defects. I have made two different purchases from Mark and both watched were the wrong watch. I kept the watches. I was most disappointed with how Mark(or someone speaking for Mark) was defensive and only admitted they where the wrong watches after I told them I was a member here on RWI.
Good luck and I hope you get this sorted out.