Child, I also spotted that on eBay and was quite fascinated by it, wondering who might be tempted to go the extra mile and buy it.
Another couple of items on eBay I have been watching are
a pair of original sketches by Roger Garland. One is for a well known book cover and the other of Tom Bombadil. I like his work as I have a boxed set from the mid 80s which had it on so it brings back memories. I did note that this also seems to be the artist himself who is selling these sketches!