Can you get a closeup of the coin and if possible, another closeup of where the error is on the coin? As is, I can't tell if it is a De-lamination Error (Lamination that has separated from the surface of the coin), struck through a piece of Lamination from another coin that has long since separated from the surface of the coin or if it was struck through an unknown material (such as wood or cloth or other)!
I agree that from the pic, it appears to be a De-Lamination Error! However, while some De-Lamination Errors are rectangular, most often, they do not have almost perfectly squared corners and straight lines from where the Lamination separation occurred.
I went back and looked at it again and it looks as if something was on the coin when it was struck. maybe a piece of tape. The coin still was fully struck except the part where the error is. The date and everything within the error area is legible, just blurry.
I am guessing this is only worth a slight premium.
While without better pics or seeing the coin in person, I can't be certain to the error, I copied and pasted the pic to my' computer, blew the pic up and believe that the coin was "Struck Through" by a piece of de-lamination that separated from another coin. I state this because even though there are linear (orientated along the length of the error) striations in the struck through area that are consistent with the appearance of a lamination separation (de-lamination) error, the coin's surfaces inside the struck through area appear to be too smooth and hard to be a Lamination separation and the toning in the struck through area is the same as the rest of the coin (i.e. the area inside the struck through area is not rough with pieces of metal sticking out and/or up and/or overlapping and the toning is not different from the toning on the rest of the coin). This points to the offending piece (de-lamination piece from another coin) separating from the O.P.'s coin not long after the coin was minted/struck.