Extra fill covering all of "WE TRUST". Also looks raised and filled bottom right side of the wheat on reverse. I also saw that some of these were possibly punched on foriegn planchet. Valuable? Rare?
Might of been rubbed away over the years. Probably just wear.
Does not look like an error coin. In that condition, a collector might pay as much as $1 US dollar to add it to his or her collection.