‘Stocks and shares’ (and commodities) means all sorts of bubbles in all kinds of things. Bubbles happen all the time, most recently in bitcoins. With watches though, it remains to be seen. For as long as people still want particular watches, high prices are not automatically a bubble. In the art market, high prices for Picasso do not imply a Picasso bubble. There was however a Damien Hirst spot painting bubble, which has now burst.