There seem to be at least three bindings for the book (green with gold bell, brown, and plain green), no priorities known, and at least two dust-wrappers (the color variations may be due to scanner settings). I have gathered most of these scans from the internet. My own copy is shown at bottom, with the plain green boards. It was apparently distributed to the American market, for the copyright statement is inked out on the copyright page, with "PRINTED IN GREAT BRITAIN" rubber-stamped underneath it.
7 minutes ago