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Patek Philippe

I believe the differentiator with Patek finishing is if the piece has been through first and second mounting.

 

My understanding is that this first and second mounting process only applies to split second Chrono, minute repeaters, tourbillon etc. This is also the cutoff for servicing at the factory where PCC and below can be serviced at various sites around the world.
This extra level of finishing is visible under a good loupe and for instance there are some excellent photos around on the web showing 5170=5270<5370 even though the base calibre is the same.

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