Following some of the threads posted here I have come to the conclusion that some of you super car guys might be the best suited to help. In the image on the right side is a couple blems that look like the wheels have had metal replaced or something. I'm told all 4 wheels have spots about the same. Any ideas as to what they are? I was told these are '60's vintage wheels that have been restored. Any chance it's just a casting flaw that has shown up after resurfacing?

Thanks in advance,