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G'day Mike,
My initial thought, based upon the 2 photos is that the mirror looks like it needs further cleaning. If you reckon the mirror really is clean then I don't know.
Have you tried shining a torch at the front of the mirror while looking through the rear? If the coating is deteriorating, you will be able to see the torch light through the coating. You will always get some pin holes, but if you can see most of the torch beam, then it is time to consider recoating.
Cheers,
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