Woodsy, I have managed to get a decent translation of page 81 from the Japanese Thunderbirds Merchandise museum book, here is how it translates and what it means.
"Sawa Boeki co. imported toys Century 21 Toys
Project Sword R/C Zero-X toy
In the early 1968 Century 21 Publications issued an annual featuring the Mars project and introduced 17 space probes in it, associated with US Apollo project.
Zero-X is one of them and it also appeared in the film Thunderbirds Are Go.
The craft body by Century 21 Toys consists of five detachable parts and moves backwards and forwards with a transceiver-shape controller. The two main wings have friction drive and MEV works either on its own or by r/c.
Sawa Boeki trading company introduced the Mars space probe toys in Japan in May 1968 , and some Japanese weekly magazines for boys (Shonen King, Shonen Sunday) had tie-up campaign and offered the toys to readers as prize.
original price 2,800yen."