@rba, looking at the coin a little more broadly that just that big ol' grey spot on Abe, you can see that there were plating issues when this coin was struck. Specifically, there is split plate doubling on the date, parts of the bust, and TRUST.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz