I found the same thing on my 92 D! I have googled, Ebayed, ECT until I felt like I was going crazy and couldn't find anything until this post. I'll try to add some pics of mine because they don't "pop" they are solid but also I have a bit more than just that 1 spot.
tabbyjane, to CCF. Always best to start your own thread. Your coin has a linear trail gas bubble also. They do not always "pop",some times they are hard debris between the copper plating and the zinc core. John1
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