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Is there an app that can give you a idea of a type of grading?
Perhaps, but if you will allow me to be old fashioned, I think that examining the coin for yourself and noting which areas looks good and bad and by how much is a better way to grade your coins and potential purchases.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz