So, I have been reading these forums and trying to learn more about coin grading for my new collecting hobby.
I have seen a many posts refer to a coin with "RPM", but I am not sure what this means.
I know what it means back from the days when I had Vinyl records (yes.. I'm oldish..), but not sure what it means for coins...
I don't see a reference to this in my "
RedBook"..
What does this mean, could you provide some examples, and why is it important?
Thanks.
Michael
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