Assuming you have more than 48 hours left before the paypal deadline, send him 1 last email, explaining the situation (cordially & in simple English - remember, alot of Asian sellers rely on translation software, which often outputs less than inteligible prose) & giving him 48 hours to respond. Then, since it is mid-week & there are no Asian holidays to keep him from responding that I am aware of, if he fails to reply with something reasonable, you can then say you gave him every benefit of doubt.
By the way, recently, I have discovered that paypal treats rep watches just like any other purchased item, in that they will act on the buyer's behalf to refund your full purchase price in the case of a rep watch seller that either fails to deliver (as in your case above) or ships a watch that differs from the watch pictured/described on their website. Now, I would not assume that they will always help every buyer in every situation, but, in my case, I am batting 1000. In the past 6 months, I have had to inituate 5 disputes with (non-RWG) rep sellers over fraud or bait-&-switch tactics &, in each case, I have gotten all of my money back & paypal was well aware of what I had purchased. The trick is to do your due diligence before hitting the buy button. That is, email the seller & ask him to verify that the pictures & description on his website are of the exact watch you will receive &, if there are any details that are especially important to you (for my project, case size was all that mattered), indicate those specifically. Then, copy all of the seller's pics to a folder on your computer along with a copy of the webpage itself. Rogue sellers have a habit of changing or removing webpages when they get asked to verify details. This way, if there is a problem with the sale, you can make a pretty substantial case against any defense a rouge seller might come up with during a paypal dispute.
Good luck.