Unique 1943 D Copper Penny Sells For $1.7 Million

As far as is known, there is only one 1943D copper penny in existence. This unique penny just sold for $1.7 million. From all three mints, there are only estimated to be 40 of these coins remaining in existence with about 12 confirmed to exist. Youtube user cvenzke410 says he has one, but I don't know which mint it is from. Dunno why he is asking youtube users for their opinions on its worth. That's a task for experts.