As a USA Coin Collector, I have struggled with buying and selling USA Pennies, Nickels, Dimes, Quarters, Half Dollars, and Dollars.......Because I just did not know how to RATE these. SURE, photo grading system was there, but it always looked like my coins had to match up to PERFECT coins from the US Mint. Professional Graders used parameters that I did not totally understand.....
So I developed a RATING system that I only use with Circulated Coins. It uses the "Words" in Photograding, Then you have to go to MY Grading Table.
There is no Mint state rating because these coins are Circulated. Then you subtract 3 items that I found occurred outside of the US Mint. (Cleaned or should be, Damaged, Altered)
And you add one item that the Mint did, it's an error, minor errors >>> on a scale from 1 to 10.
My system allows a Coin Collector to differentiate the same denomination coin from another coin, improving the set.
You have to TRY it.... The scale is 1 to 100 ----!