The official guide book came with an obi. It was reprinted several times as detailed on the copyright and contact information page. For example, the 8th printing was released on 2000.12.19, and the 13th printing was released on 2002.03.20.
1. Front with obi
2. Back with obi
Thanks to eBay member gametigerfr (image 1) and Mercari member BAKI (image 2).