You don’t have to be a billionaire to own at least a good watch. I don’t think that the “classes” are based upon the richness, rather than by real values of the world: wisdom, charity, literacy, dignity, humanity. You couldn’t buy this things, they come from the eternal human culture. I don’ even think that there are classes at all.
And you couldn’t buy one more thing regarding watches: taste. You don’t have to be rich to have a good taste, you could be a poor man with a great taste and literacy, then you are much more wealthier than any other billionaire in this planet!
Yours,
Adam