Grading 1909 To 1958 Pennies - I Understand The Struggle. It's not easy grading pennies or cents, they're small and most are darker in patina, referred to as "brown". Copper is a highly reactive metal as well as the alloy bronze, which is mostly copper, so pennies can quickly corrode, have environmental damage, artificial toning and be cleaned and retoned or just plain ugly.
Then you have to worry about counterfeit key dates and common dates, I have two videos on this YOU need to watch.
Link as follows:
Grading MS67 and MS68 Cents https://youtu.be/FzzOhEILITM
Common Date Counterfeit Cents https://youtu.be/qPBgQIUVA8s
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