Probably, but it could also be the result of general wear & tear. As I've mentioned before, it's a good idea to post photos, both obverse & reverse, of the entire coin in addition to any close-up. They may help to diagnose the cause. Would you expect a doctor to give you a diagnosis without examining you? Chris
Sort of reminds me of this piece... http://www.icollector.com/1-DOLLAR-1967_i19827661 Which the auction house called a "die set-up strike error" (it did not sell by the way)...
Not sure... I was at the auction, I thought it did not make reserve... perhaps an internet bidder bought it... I generally don't touch this kind of error - unless it is certified by either NGC or PCGS.