Here you go... this picture is comparing the backs of the two. The China one is on the left and the Authentic 12 South Product on the Right.
http://www.flickr.com/photos/23863998@N02/6427179543/lightbox/
This next shot is the two spines of case The top is obviously the Authentic but my book book is darker than most Authentic Book Books.
http://www.flickr.com/photos/23863998@N02/6427170649/lightbox/
This shot is of the inside leather area the holds the iPhone. The Authentic one is on top and the China one is on the bottom. This area may be synthetic leather on the China product.
http://www.flickr.com/photos/23863998@N02/6427173277/lightbox/
This last shot is the front flap that coves the phone. The Authentic one is on the left and the China product on the right.
http://www.flickr.com/photos/23863998@N02/6427176567/lightbox/
The lining on the inside of the case may not be genuine leather because the texture doesn't feel like it but that is probably why this case is less than half of the authentic one. I have since put this China model on ebay and its all but a memory now.
For those who are willing to sacrifice the inside holding not being made of real leather, then this is not a terrible investment but I am skeptical to is durability. I for one love the authentic product and would recommend those who are considering the Book Book for long term use stick with the authentic product. Those who like to switch out cases frequently might benefit form the knock off because its an inexpensive option for short term use. If you have seen and held an authentic Book Book, this knock off will probably leave you a bit disappointed but you are saving money. For someone how has never seen or held an authentic Book Book... hey... you know no better.