Wear on speaker cap coating

Hi there,
I saw a couple of vintage Coral speakers for sale. They look in good shape in the picture, except that the center caps, which are supposed to look like polished silver, have a dull look for most of the surface, except for the rim. See pic.

Shall I be concerned about the sound quality? Aesthetics are secondary.
Shall I be concerned about further degradation? E.g. is the silver coating detaching and will it eventually flake off?
Is there some kind of service to restore the caps to their original sheen or replace them for a reasonable price?

Thank you.
 

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