Looks like very light greased dies to me. This can be easily picked up by dies that strike a blank instead of a planchet. Blanks that have not been washed will have a very thin layer of oil on them. If you have a roll of blanks that have not been washed they will stick together. I have several rolls of unplated zinc cent blanks and I have to pry them apart to get one from the stack. Such an effect does not generally last long on the dies and gets struck away very fast. Of course this may or may not be the cause of what happened here. Just one possibility.
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