Tourbillons. It’s impossible not to have a conversation about Breguet without mentioning them, much less walk through that manufacture without seeing them. The tourbillon is Breguet. This two hundred year old mechanism is (and we have said this ad nauseam so please forgive me if you know this already) a mechanism that constantly rotates the balance wheel, balance spring and escapement, to counter the negative effect of Earth’s gravity on accuracy. It improves the overall precision of pocket watches, although the usefulness of the tourbillon in wristwatches is, to this day, very much a subject of debate.