My guess is a lamination on the 1980, and the 1996D doesn't have a DDR-005. I'm guessing it's an unlisted DDR. Doesn't match anything on Wexler's either.
The 1980 almost looks like a mortar set error, area where plating fell off the die, but I don't even know if the Denver mint had plated dies, so I'm a little confused. Someone else will probably be able to give a better answer.
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