http://www.somestamps.com/domain-argent ... rs-5P.html
There is a plate variety that is almost impossible to spot:
http://www.somestamps.com/domain-argent ... -line.html
It has a long horizontal scratch to the central design.

Note that the line ends at the denomination box.
This following variety has a long scratch across the palm.

There are other minor scratches to the late issues plate.