Jeremy Norman Collection of Images - Creative Commons
Here is the upper cover of the binding on my copy, laying in the jewelbox style full brown morocco case protecting the book. The section holding the binding is aquamarine velvet; the lining of the upper part of the case is blue silk. This style of a protective box is what one would associate with a case to hold jewelry rather than for protecting a book. It suggests that the original owner for whom the book was produced appropriately regarded this volume more as a kind of treasure for occasional display than a functional book.