Toby
Most of the books I've seen have been signed, so there doesn't seem to be a premium for that. The book is
perfect bound , and given the book's size (about 7 x 9 or so, without looking), the binding tends to fall apart if opened wide.
In nice condition with none of the binding problems, the book should sell for around $300. Copies I've seen on ebay over the last years have varied from 200 to 400. It is a difficult book to find for a modern book.
Max