So, how do we know it was a grease issue? Note the disappearing devices. If they were polished off, they would be smaller in size.
If it is a struck through grease issue, the grease prevents the tapered top of the devices from showing and what you would see are the letters at the base of the die, which are wider there. So on this image, the last image showing is looking wider.
Here is a 'Bert' coin image I saved and it fits your thread title perfectly: