[Kraftwerk]

NoRush, That Hodinkee article answers the question well.
The level of complexity and technology makes you understand a what you are getting when you get a modern Rolex, good read for any enthusiast or curious person, thanks.
BTW, That area near the Jura Mt range is sprinkled with small factories, all building movements by hand for different manufacturers. Rolex is not the only name they are just the biggest player with 'the most toys' to gain such perfection and accuracy. There are some other very good timepieces being made up there.