The complete guide and world guide is in Japanese and covers the very first release of the PS2 game. It has its original obi. Here’s what I think it contains based on the limited English and pictures:

– Item and Weapon lists
– Monster and character descriptions
– Game walkthrough
– Endings and bonuses
– Area maps

The guide even has a recap of Silent Hill 1 including plot summary, character/monster profiles, maps and scenes.