Very interesting. A novel twist on the older, more simplified way of grading. I don't know quite how to feel about this one.
On the one hand, A-F makes it easy to broadly group grades of coins. On the other, it carries a negative connotation. For example, a nicely circulated 1916 SLQ in Fine isn't a "D" (in the sense of the gradeschool approach) - it could be an A+ for that given coin. Not all non-MS coins are "Fs" and "Ds". However, if you look at it strictly as a grade ranking, I guess it is OK.
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On the one hand, A-F makes it easy to broadly group grades of coins. On the other, it carries a negative connotation. For example, a nicely circulated 1916 SLQ in Fine isn't a "D" (in the sense of the gradeschool approach) - it could be an A+ for that given coin. Not all non-MS coins are "Fs" and "Ds". However, if you look at it strictly as a grade ranking, I guess it is OK.