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I did a quick search and found this article from timeandwatches , which has some scans of past Minerva watches. One of the photos show a rattrapante pocket watch, which does indeed, have the top subdial sitting slightly higher up than the lower one! (I verified it by measuring the photo digitally) I

This example below, taken from the deconstruction by The Naked Watchmaker , showcases two defined interior corners on the 777 movement. While admittedly not the cleanest execution, shows some of the effort needed by hand to execute the anglage. The anglage also appears to be wider and more rounded.

In some 5177 movements (I'm unsure if this applies to all new 777Qs), the interior angles are now replaced by rounded ones which are likely done by machine. This can be seen in this video at 0:41, officially from Breguet: Regards, skyeriding

Two clicks are fixed to the inner ring of the crown wheel, which both interact with a fixed star wheel/ratchet hub. The hub itself can freely rotate slightly, as it has two radial track/grooves. This allows for the "slack" to prevent overwind of the mainspring at its fully-wound limit, just like a r

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,but that might be one possible reason. If the grinding happens at anytime elsewhere, then I'm not sure and would need a watchmaker to ascertain. Regards, skyeriding

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First, let me say that its nice to see that both AP and VC tourbillons here have an overcoil hairspring, which encourages concentric breathing of the spring and gives better isochronism (i.e. the timing is constant regardless of of the varying power as the mainspring unwinds). Lower-end tourbillons