Coneca has two listed ( TDO ) but no images . Pcgs has the CherryPicker images http://images.pcgs.com/CoinFacts/11694146_1257146_max.jpg and it looks like it could be it .
Don't know if this thread from CONECA's message board will help or not.... http://board.conecaonline.org/showthread.php?3554-Kennedy-Hlaf-Dollar-1968-D&highlight=1968-D
Mines very close to the stage or state, as this one . http://images.pcgs.com/CoinFacts/29395014_41466281_max.jpg