Coins like this are so rare
A minted coin should be pounded only once on each side. As you can see, this coin was pressed twice. Consider all of the coins you’ve ever seen in your life, and you’ll realize why the likelihood of this occurring is quite remote.
Coins of this type are extremely rare, and can frequently fetch a premium price when sold to coin collectors. That, too, demonstrates how improbable it is for something like this to occur.