324 is actually a very good finished movement for the Pateks at the entry level price. Definitely machined (just like 99.99% all other brands), but definitely also hand finished/polished (not to a very high level of course). Otherwise, the milling marks will be more pronounced. Regarding level of polishing, I also keep in mind of the thickness of plates. The high end Pateks have generally also comparably thicker plates. 240 and 324 have thinner plates, thus also harder to finish.