Hi. I liked your post; The 1989D cent you are referencing is an "error" coin. It has a copper blank instead of a zinc blank at it's core. Here is an article on it: https://www.coinworld.com/news/us-coins/2016/09/1989-d-cent-struck-pre-1983-copper-sold-for-just-over-thirty-five-hundred.all.html
I hope you are as lucky with your penny!
Thank you and Steem on!