The marks on the devices in the direction to the closest rim are die wear or
DDD on these single squeeze dies. The marks on the other side of the devices is
Machine Doubling. Neither are a doubled die, as the die is normal. The Die wear issue is a Die event. The
Machine Doubling is a striking event. So this is never a doubled die, unless the hub is doubled. Events happen, but doubled dies are created on the dies and the coins struck by these dies are called doubled dies.