Looks like glue to me. It's clear and smooth and you can see air bubbles between UNUM and the building. A soak in acetone will likely soften it enough to be removed.
I would say glue or even something like j.b. weld. If you look at the last picture where the material meets the edge you can tell it didn't part of the coin. If it was you wouldn't see the line where it stopped like that.
It might be epoxy, or body filler? But it is not a Cud. If it were a Cud it would raise above the rim and leave a void on the opposite side. (you can see the design under the substance also and might not come off with acetone but not an error)
Thanks guys-its definitely not glue but being how its definitely not an error I'mnot gonna bother but I do have to get some acetone ive needed it few times now-do you need to soak them very long in acetone? As far as this nickel I'mthinking its that jb weld or one of the 2 mentions that coop had-i do see the design elements under part of the oddity,thanks again
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