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If you check out Tim Mosso’s review of the 6119G on YouTube (in addition to many of his other Patek reviews), he says the 30-255 is “started by mechanical means but finished by hand.” As far as reliability as a source goes, both he and his company, Watchbox/Govberg, are quite involved as both resellers/ADs of Patek and appear to have a good relationship with the company.
The answer is basically a combination of machine + hand finishing for most Pateks that are not the highest end complications.
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