Machine Doubling is caused by a loose die bouncing on the coin, effectively striking it a second time. This flattens or scoots the devices to one side, leaving a flattened doubling.
Die Deterioration Doubling occurs when the edges of the devices on a die start to chip away. This in effect raises the field around the devices creating ridges and hills that were not supposed to be there.
Biggest difference in appearance between the two is that
Machine Doubling effectively makes the resulting devices thinner than normal because of the part that was flattened -
Die Deterioration Doubling is an addition to the normal thickness of the devices.
Posted 12/29/2007 12:27 am
