It sounds like you need to review some blockchain fundamentals. None of the above should be unclear in any way if you have a basic understanding. I could go on and try to address your questions, but really, at this point you may as well just be trolling. The way you have been strongly arguing above is not founded on reality if your last questions are honest.
This. How does this magical transfer happen? The moment you say "authorised resellers", please read comments to this: https://news.ycombinator.com/item?id=27435785
> the payment could even be done atomically with the assignment
What's to stop an automatic payment with the assignment of the counterfeit watch?
> As long as the buyer validates it, the only one who could forge watches would be Rolex.
Why?