I saw that you have one SKU at the Square O Ryan Sheckler Twitch, but there have been 2 editions. One with only his signature at the stem. And one with a signature at the left stem and a ryan sheckler silhouette at the right stem. The SKU is 12-793
EDIT: also the color of the icon differs. The 12-793 has a Chrome Icon. See;
http://www.oakley.com/products/4139/18691