That's a Die Crack, but it's very common on these years, so there's no added premium. Also in "IGWT", that's Die Deterioration Doubling, not a Double Strike. There's no premium for both of these. That's not what a Double Strike is. http://www.error-ref.com/die-deteri...on-doubling/ If you scroll all the way to the bottom, you'll see a doubled struck coin, and it'll explain to you what it is and what causes it. http://www.jimscoins.com/error_coin_examples.php
Errers and Varietys.
























