Yeah that is the 2008 model Rolex DSSD (Deep Sea) Sea Dweller. Has a ceramic bezel and helium escape valve as per genuine model. This one also has a genuine swiss movement where some have a cheaper asian clone. Oh and its one heavy lump at 205grams (1/2 lb)
Link to Wiki page.
http://en.wikipedia.org/wiki/Rolex_Sea_Dweller
These are virtually indistinguishable from the real thing, you have to look real close to the likes of spacing on the no."10" on the bezel or the thickness of the type on the face may be a fraction out.
I will post some close ups tomorrow.