This was a book that tended to get significant use. For example, the binding on one of my copies is so worn that the gold stamping on the spine has become almost invisible, and the very unusual and ornate design may be easily missed.  Notice how the top of this design incorporates a version of the Hoe Eight Feeder (or Eight Cylinder) Type Revolving Printing Machine, and on the bottom we see the Menamin & Ringwalt printer's mark adapted from the original printer's mark used in the 15th century by Fust and Schoeffer. If you enlarge the image you can read their motto, supposedly a translation from the German, "God Greet the Art."