Posted 05/15/2014 12:45 am
This is caused by a partial blockage of grease on the die. The overall size of the device is normal, but the devices are tapered at the top. When grease get into the die and blocks the die from forming the device, you get a coin like yours. When a die is over polished, you get the opposite as it removed the field and it make the devices thinner. I've seen a few examples of these. If anyone would like to see these, ask. But this is a form of a Struck Through Grease error. (Partial blockage)
Edited by coop
05/15/2014 12:46 am
05/15/2014 12:46 am
