I first thought a few weeks ago that it was a Minute Repeater on which they added the center enameled part but it is so much more than that in the end. That's why leaks I think may bring more problems than the pleasure to see on a picture a novelty yet to be released. The 5531's case is something I would love to see in a more affordable watch (but I doubt it as I imagine they will keep it for the high-end references Patek can provide).
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