You're welcome Aline.
Well, this was one of the items I searched the most as soon as I saw a French magazine with Bad Japan Tour '87 pictures and info.
There 2 categories of items that have been released in Japan, either for the Bad Tour September/October 1987 (first leg) or the Bad Tour December 1988 (second leg) and very amazingly they're ALL different, including the Bad Tour Book.
At first, I thought as you did, it was an original hand print and signature but after getting one, I realized it's a very well done printed hand print with his beautiful and complete signature he usually did for special items.
It was sold inside the stores at Korakuen Stadium in Tokyo, Yokohama Stadium in Yokohama and Osaka Stadium in Osaka.