Possible Error Cent in $2 worth of Pennies

I was going through a few rolls and found these 4 coins about a week back. The Steel cent pictured is, I'm pretty sure, only the 3rd one I've ever found roll hunting.


I also found this one - a 1968-D Lincoln cent that looks to be one of two things,



1 - either a grease error, as from some angles nearly half of the letters on the reverse are nonexistent, or



2 - severe post-mint damage.

What do you think?

 

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Post mint damage reverse. Gunk on the obverse of the 1968D.

 

#1 glue residue

 

Not a mint error.