Patina on a 14k Jubilee band?

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Hi,

I recently bought a vintage 16013 with a jubilee bracelet, and I think it's 14k as the serial on the band ends with a 14.

Anyways, the gold part of the end links seem to have a copper-ish rusty looking patina. Is this normal? Is there a way to remove it? Seems to be just the end links, everything else looks pristine.

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