So what does this mean: Struck through a capped die. First we will consider what a die cap looks like:
Here we see a die cap that fell off the die and it made if into probably a bag years ago. Sometimes they fall off on their own:
Sometimes there are more than one planchet that gets bonded together for form a "Bonded" die cap:
But why are we calling this a struck through a capped die? The die is still covered with the die cap:
Note the design on the reverse of the die cap? That is how much detail is left on the cap that transfers to the coin. Thus the weakness of the design of the coin posted here.
Sometimes the die cap get loose on the die and rotates causing a different striking look on the coins:
Sometimes the die cap doesn't fall off the die and eventually thins:
So these cause the distortion of the strike because they capped the die and the hammer or anvil die will show this striking event on coins. So the proper term is "Struck through a capped die strike." The item preventing the strike is called a "Die Cap." I still could post many more examples of a struck through a capped die, But I think we pretty much know what they are, but I wanted to show what causes this to happen.
CoopHome : Capped die, Struck through a capped die.