A "tapper" describe elsewhere on my site a couple times. No real value besides face value.
📋 Item Submitted
2016 D flat clad edge
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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The other three I have
Just face value, 75 cents.
Die error, die marks
The circular pattern on this quarter is typical of that caused by counting machines, and is regarded as damage, not mint error.
Got from a friend
Looks like it may be a reproduction.