I would lean towards a strike though error. They are fairly well known. Google it and see what you think.
I got word back from Mike Diamond so look for this coin and some others in an upcoming Coin World Collectors' Clearinghouse article on "die crazing".
The Collectors Clearinghouse article on this coin and others that have "die crazing" is now online for the 2/24 edition of Coin World. For those that have online access............... http://editions.amospublishing.com/WDCN/default.aspx?d=20140224