N.B. This does not come with the gaffed book, but one could be manufactured from the description of the gaff.
 
Publisher's description:
 
This is an incredibly clean Book Test!

A prediction is made on a single card which is then inserted face-down into a book at any position desired by a spectator (genuine free choice). The book is then opened at this position and the top word of either of the two indicated pages is chosen by the spectator (genuine free choice). Incredibly, the word selected under such fair conditions matches the prediction written on the card!

Uses just the one card. The pages of the book are all different. Spectator has genuine free choices. A refreshing and direct book test without the usual contrived counting procedures. The revolutionary gaffed book does all the work for you!
 
Condition: Very good, some minor wear and creasing. 
 
Binding: Booklet.
Year: 1989
Publisher: BHM Industries
Pages: 24
Dimensions (to nearest cm): 21 X 15cm