I have a question. A die crack would be raised or obtuse on the coin right? This one looks like the coin itself is cracked.
It was so wide I was wondering myself if it was a planchette error??? I see where it filled in leaving a die chip. Looks cool to me! Wonder what the others will say.
Looks like a die crack to me, but you have the coin. If the planchet is cracked, take a look at this: http://www.error-ref.com/cracked-planchet/