The devices are thinner, it can't be a Struck Through Grease issue unless there was a partial blockage of the devices on a certain direction. But it is an over polished die issue. [RED]What makes me so sure. A grease blockage would not be equal on all the devices like your coin. It is an over polished die issue. When the dies are over polished, the fields are removed/thinned. This affects the devices buy reducing the height of the devices:

This does not only affect the devices:

How Grease Fill affects the dies:


This does not only affect the devices:

How Grease Fill affects the dies:
































