Thanks Moxking and very much appreciated. It is solid and I am definitely going to hold onto it as one of my best Die Deterioration examples. I like the curvature of it at the inner lower portion of the "N" in "Cent" where it stops and thought it was interesting.
It looks like a corrosion dome or large plating blister. I found this image on Coin World and a link to the Collectors' Clearinghouse column on Surface Bumps on coins.
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