Hey there!
Looks like the card's text layer was grey stamped / thick stamped when it was printed, so it ended up with an inking error. It's just a minor error that usually happens when the ink for printer for the card's text is low. Is it just me or does the "D" in edition not look 3D? It looks like it's just regular thick stamped. Kinda hard to tell though, are you able to get a more clear picture?
Somewhere I've got a Kindgra where the entire text layer is stamped incorrectly and more importantly, duplicated about a millimetre off. If I find it I'll post a picture cause I think it demonstrates exactly the misprint you've got on your hands here.
It's not a terribly uncommon error, so I wouldn't bet on making money off it, but it's definitely a neat find! :)
