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Question of the day- and this is about blank planchets...

I have a penny I’m looking at. It is a blank planchet. Even though it is truly blank, I can tell with pretty good certainty that it is a 2019-D. How is that?

P.S. I thought this might be a good thread to start to share our numismatic knowledge each other.

Was it found in an original bank roll or bag of other normally struck 2019=D cents?

Good guess, but no. I toured the Denver mint in 2019 and got a plastic sleeve containing two pennies. One was a regular 2019-D in BU. The other was a blank planchet. This is the same plastic (cellophane?) used for mint sets. It was actually a pretty cool momento.