Agree, beautiful dial. Agree to disagree about Clous de Paris/hobnail. It's the first guilloché pattern that pops into my mind, and incidentally the first pattern mentioned (and beautifully displayed) on the Breguet web page on engine-turned dials.
http://www.breguet.com/en/house-breguet/unmistakable-signs.
I would quibble with the term guilloché only if it was used to describe a dial that was not engine-turned by hand. I'm not sure whether that is the case or not with this dial - it looks like little Clous-de-Paris guilloché pyramids to me - but I'm sure that someone here knows.
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