man...if you were an inventor , and spend time inventing something nice, them you don't make money out of it, would you like that?
I would think that this is extremely uncommon. I think the following scenario is more likely:
"X buys fake watch, X likes fake watch, X buys the real watch"
>who is the owner of the design?
The whole fake/not-fake thing usually has very little to do with the actual design of the watch, but the branding.
"X buys fake watch, X likes fake watch, X buys the real watch"