The clash is thought to be the tips of small feathers from the wing of the small eagle motto on the reverse , I have read several paper/articles which have been written on this particular coin, and I'm convinced ita die clash, and as Bill said not a true variety even though it is listed as a variety and is called a variety by many .
we don't need to argue semantics , its a die clash , and its recognised by the collecting world and caries a premium over a coin that does not have it .
enjoy it Kceb10 its a cool coin !