Note the L in LIBERTY with overflow and the "blot" just to the right of lincoln's back. I know there's a ton of them out there, but I've never seen one quite like this. Is it worth a buck? A quarter of a buck? A penny? A good laugh?
It is definitely not a greased strike through, as this would obscure some of the details, instead of creating a raised bump. This could be a die chip, or bubbled plating, but it is difficult to tell from your pictures.
The "L" is a die chip and the blob is a coating blister. The blister reduces the value, if anything. The die chip is worth more than a good laugh, but not much