Revstampman is being cheeky, as usual

He meant that the image on each stamp had shifted left or right.
that was the difference between the two stamps
It wasn't the image that shifted but the perforator.

"Is it the wind that moves, grasshopper, or the flag?"
I wonder what else I am moving on in my "duplicates"
that is of value, that I am completely ignorant of?
I wonder when we get to heaven(presumably), we learn of all these mistakes
