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Message:: [QUOTE="Insider, post: 2692158, member: 24314"]It is impossible to tell on this coin as there is nothing left in the depression.  That's possibly why no one cares what got between the planchet and die when the surface is irregular.  Grease is the commonly suspected culprit.  In cases where an object (staple, etc.) made the depression, everyone cares.  In some cases, sawdust struck-thru's are still embedded into the coin so we know what made those.  When the sawdust is removed a flake-like outline (often with a wood-grained surface) remains.  In other cases (seen on Franklin and Washington coins) a clear gel containing microscopic debris that "imitates" this type of error is found next to the rims but this is not from a struck thru as the gel can be removed and the underlying surface is unaffected.[/QUOTE]