Here is what John1 was referring to.

Note how the obverse devices fall over the rim of the coin?
The hammer die is adjustable, the anvil die is stationary. They need to center the hammer die. When this is not correct a batch of MAD coins happen. They can correct it, but sometimes they don't. So these are collectable when the devices fall over the rim.

Note how the obverse devices fall over the rim of the coin?
The hammer die is adjustable, the anvil die is stationary. They need to center the hammer die. When this is not correct a batch of MAD coins happen. They can correct it, but sometimes they don't. So these are collectable when the devices fall over the rim.





















