Ok then I was wrong on what your coin is. Also in the future it's best if you do not post a coin with distracting background like the one you...
Am I right @Zach1983 that it's similar to the rim you have. Also the edge of your coin?
What I see on this is a partial collar error. Similar to this link. https://minterrornews.com/priceguidepartialcollar.html
reminds me of a partial collar error
The D represents Denver you have a minor grease filled die
I'm sorry I am just tired. Your coin is normal these youtube people keep trying to make some coins special when they are not.
it's definitely an error? please provide a link to your 1977 minted in different color rather than silver references.
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