I want to check on this one. I am away from my references. That looks like a strike through to me. I am having trouble seeing damage without it affecting UNUM. @paddyman98
Inside the craterlike feature you can also see the letters UNU from the word UNUM twice. Overlapping each other. I don't know of anything during the minting process that would cause that effect. @Fred Weinberg
Paddy could compacted grease and debris become compacted with this look? I am imagining that the compacted strike thru became unattached three times before it flipped over and struck the planchet. Is that possible?
I was thinking some kind of Grease Mold Doubling? http://www.error-ref.com/grease-mold-doubling/ But probably not. @desertgem just called it PMD also
Also the letters are backwards. So some how clamped down on by another penny, but just the Unum part?
Just saw this thread - I think Pickn&Grinin got it - It appears to be a piece of compressed metal (a flake or two off another planchet that fell off the die at this point, and dropped onto this planchet just before it was struck. Notice that it's incused, which means something positive, or raised, caused it. A piece of metal, whether compressed metal/grease, or just a piece of detached lamination, was in that area of the die. A 'dropped letter' type of error, imo. What is unusual about it is that the piece that came out off the die dropped in that exact spot, just under the lettering that matched the compressed piece of metal....usually they drop randomly, and not right in the same spot as the original part of the die that had the compressed metal. I'd also like to see what Mike D. says about it.
Odd that no one has mentioned that the extra letters such as in the last photo show a straighter line alone the top, whereas on the cent they more curved. The letter "E" in the same photo show no sign of mechanical doubling in any direction so I think that has to be eliminated . The letters also do not exactly come close to being the same shape as the original. The thing that bothers me is how would a dropped letter grouping not damage the tip of the E? Jim