“Blooming” on 2533.50 America’s Cup 18 K Gold bezel?

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I’ve come across a pretty clean specimen of this watch for a great price but the bezel is showing a faint gold hue. This solid 18 K Gold bezel is still “matt-finished” so it doesn’t appear it was discolored by polishing. Any input; can this be restored to it’s original color?
 
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Photos would help…
 
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He added a photo to the other thread he started on the same watch.