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Patek Philippe

No. All of these materials are fine.

 

The main technical reason why companies use brass, German silver, or 18K gold is one reason and one reason only.  Machinability; all these materials are machinable using modern CNC tools.  And Secondly, these materials are not magnetic.  Meaning these materials are not affected by magnetic fields and cannot become induced to have their own magnetic field.  Thus, to choose among any of these materials is just preference and style of the manufacturer.  

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