Bison Error or a Filler?

Tomy

Searching several rolls this morning as I drank my coffee. The only error I found was the 2 of 2005, the top curve was filled in with metal (about the size of the dot from i in Liberty). This isn't as exciting as some of the other errors I have heard about, but was wondering if this is worthy. Sorry that I am not able to provide a pic, but hoping my discription is does well enough. I would appriciate your response. Still waiting for my Mint Rolls, due to be shipped 4/29.