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Richard Mille

There is tarnish and then there is corrosion. The latter being

 

the real problem.  Some metals, including the case material of the RM009 change over time - a change in the way the metal reacts to its environment.  This would show as a tarnish.  Corrosion would imply that the metal is not only degrading, but also being eroded away.  Perhaps a picture would help.

Andrew H

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