It looks like a struck through error. Something was between the planchet and the die when it was struck and fell away after striking. Nice catch.
Not worth having certified! eBay........probably a few bucks! FleaBay with two bidiots..........$10-15! Conversation piece at home.........priceless! Chris
Too bad about the hit on Liberty's Arm on the Reverse as the obverse if your coin looks to be MS68 material!