I just watched a video that said there are pennies from 1974 with no mintmark that are worth millions of dollars. They were produced as an experiment and, I guess, not intended for circulation. Could the video have been referring to the aluminum pennies?
OP, you can skip anything promoting " no mint mark" as if it means anything. It's always either clickbait, scamming, or somebody who doesn't know what they're talking about. My 2 cents.
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