These are definitely bookbinder:http://www.yoox.com/us/44858796QB/item#dept=men&sts=sr_men80&cod10=44858796QB&sizeId=I bought a pair of the brown loafers you show in your post and they are regular calfskin. I also bought a pair of brogues and they are bookbinder and will be returned. Any of the absurdly shiny shoes like the ones I linked to above are, in all likelihood, bookbinder.
As Mr Monty has pointed out, not sure on which thread, there are a lot of Sutor Mantellassi shoes on Yoox right now that are sub $150 if you have a code. Most of them are bookbinder leather, so after a couple of years they'll look crappy, but by then you will probably be ready to upgrade anyway.
I've had a bottle of it for awhile, but still trying to find a cocktail that I really like it in. They've recently, I think, put some pretty interesting drink recipes up on the St George's site, so I'll try them soon. I was hoping to use it to replicate the Pins and Needles cocktail I had at a steak place in Vegas (maybe Craft Steak?), but no luck so far.